Relevant bibliographies by topics / Pearson Correlation Coefficients

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Academic literature on the topic 'Pearson Correlation Coefficients'

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Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Pearson Correlation Coefficients"

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Yu, Wen-Kai, Xu-Ri Yao, Xue-Feng Liu, Long-Zhen Li, and Guang-Jie Zhai. "Ghost imaging based on Pearson correlation coefficients." Chinese Physics B 24, no. 5 (April 30, 2015): 054203. http://dx.doi.org/10.1088/1674-1056/24/5/054203.

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Shan, Guogen, Hua Zhang, and Tao Jiang. "Correlation Coefficients for a Study with Repeated Measures." Computational and Mathematical Methods in Medicine 2020 (March 26, 2020): 1–11. http://dx.doi.org/10.1155/2020/7398324.

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Repeated measures are increasingly collected in a study to investigate the trajectory of measures over time. One of the first research questions is to determine the correlation between two measures. The following five methods for correlation calculation are compared: (1) Pearson correlation; (2) correlation of subject means; (3) partial correlation for subject effect; (4) partial correlation for visit effect; and (5) a mixed model approach. Pearson correlation coefficient is traditionally used in a cross-sectional study. Pearson correlation is close to the correlations computed from mixed-effects models that consider the correlation structure, but Pearson correlation may not be theoretically appropriate in a repeated-measure study as it ignores the correlation of the outcomes from multiple visits within the same subject. We compare these methods with regard to the average of correlation and the mean squared error. In general, correlation under the mixed-effects model with the compound symmetric structure is recommended as its correlation is close to the nominal level with small mean square error.
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Edelmann, Dominic, Tamás F. Móri, and Gábor J. Székely. "On relationships between the Pearson and the distance correlation coefficients." Statistics & Probability Letters 169 (February 2021): 108960. http://dx.doi.org/10.1016/j.spl.2020.108960.

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Furman, Edward, and Ričardas Zitikis. "BEYOND THE PEARSON CORRELATION: HEAVY-TAILED RISKS, WEIGHTED GINI CORRELATIONS, AND A GINI-TYPE WEIGHTED INSURANCE PRICING MODEL." ASTIN Bulletin 47, no. 3 (August 7, 2017): 919–42. http://dx.doi.org/10.1017/asb.2017.20.

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AbstractGini-type correlation coefficients have become increasingly important in a variety of research areas, including economics, insurance and finance, where modelling with heavy-tailed distributions is of pivotal importance. In such situations, naturally, the classical Pearson correlation coefficient is of little use. On the other hand, it has been observed that when light-tailed situations are of interest, and hence when both the Gini-type and Pearson correlation coefficients are well defined and finite, these coefficients are related and sometimes even coincide. In general, understanding how these correlation coefficients are related has been an illusive task. In this paper, we put forward arguments that establish such a connection via certain regression-type equations. This, in turn, allows us to introduce a Gini-type weighted insurance pricing model that works in heavy-tailed situations and thus provides a natural alternative to the classical capital asset pricing model. We illustrate our theoretical considerations using several bivariate distributions, such as elliptical and those with heavy-tailed Pareto margins.
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Shieh, Gwowen. "Improved procedures and computer programs for equivalence assessment of correlation coefficients." PLOS ONE 16, no. 5 (May 28, 2021): e0252323. http://dx.doi.org/10.1371/journal.pone.0252323.

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The correlation coefficient is the most commonly used measure for summarizing the magnitude and direction of linear relationship between two response variables. Considerable literature has been devoted to the inference procedures for significance tests and confidence intervals of correlations. However, the essential problem of evaluating correlation equivalence has not been adequately examined. For the purpose of expanding the usefulness of correlational techniques, this article focuses on the Pearson product-moment correlation coefficient and the Fisher’s z transformation for developing equivalence procedures of correlation coefficients. Equivalence tests are proposed to assess whether a correlation coefficient is within a designated reference range for declaring equivalence decisions. The important aspects of Type I error rate, power calculation, and sample size determination are also considered. Special emphasis is given to clarify the nature and deficiency of the two one-sided tests for detecting a lack of association. The findings demonstrate the inappropriateness of existing methods for equivalence appraisal and validate the suggested techniques as reliable and primary tools in correlation analysis.
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Artusi, R., P. Verderio, and E. Marubini. "Bravais-Pearson and Spearman Correlation Coefficients: Meaning, Test of Hypothesis and Confidence Interval." International Journal of Biological Markers 17, no. 2 (April 2002): 148–51. http://dx.doi.org/10.1177/172460080201700213.

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Artusi, R., P. Verderio, and E. Marubini. "Bravais-Pearson and Spearman correlation coefficients: meaning, test of hypothesis and confidence interval." International Journal of Biological Markers 17, no. 2 (2002): 148–51. http://dx.doi.org/10.5301/jbm.2008.2127.

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Masha, Luke, James Stone, Danielle Stone, Jun Zhang, and Luo Sheng. "Pulmonary Catherization Data Correlate Poorly with Renal Function in Heart Failure." Cardiorenal Medicine 8, no. 3 (2018): 183–91. http://dx.doi.org/10.1159/000487203.

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Background: The mechanisms of renal dysfunction in heart failure are poorly understood. We chose to explore the relationship of cardiac filling pressures and cardiac index (CI) in relation to renal dysfunction in advanced heart failure. Objectives: To determine the relationship between renal function and cardiac filling pressures using the United Network of Organ Sharing (UNOS) pulmonary artery catherization registry. Methods: Patients over the age of 18 years who were listed for single-organ heart transplantation were included. Exclusion criteria included a history of mechanical circulatory support, previous transplantation, any use of renal replacement therapy, prior history of malignancy, and cardiac surgery, amongst others. Correlations between serum creatinine (SCr) and CI, pulmonary capillary wedge pressure (PCWP), pulmonary artery systolic pressure (PASP), and pulmonary artery diastolic pressure (PADP) were assessed by Pearson correlation coefficients and simple linear regression coefficients. Results: Pearson correlation coefficients between SCr and PCWP, PASP, and PADP were near zero with values of 0.1, 0.07, and 0.08, respectively (p < 0.0001). A weak negative correlation coefficient between SCr and CI was found (correlation coefficient, –0.045, p = 0.027). In a subgroup of young patients unlikely to have noncardiac etiologies, no significant correlations between these values were identified. Conclusion: These findings suggest that, as assessed by pulmonary artery catherization, none of the factors – PCWP, PASP, PADP, or CI – play a prominent role in cardiorenal syndromes.
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Boucher, Beatrice, Michelle Cotterchio, Nancy Kreiger, Victoria Nadalin, Torin Block, and Gladys Block. "Validity and reliability of the Block98 food-frequency questionnaire in a sample of Canadian women." Public Health Nutrition 9, no. 1 (February 2006): 84–93. http://dx.doi.org/10.1079/phn2005763.

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AbstractObjectiveTo assess the validity and reliability of the most recent adaptation of Block's full-diet food-frequency questionnaire (FFQ) among a sample of Canadian women.DesignParticipants completed a self-administered FFQ (FFQ1), two unannounced 24-hour recalls (weekday and weekend) and a second FFQ (FFQ2) between October 2003 and February 2004. FFQs and recalls were analysed for 32 nutrients using Block Dietary Data Systems and the University of Minnesota's Nutrient Data System. Mean and median intakes were computed, along with crude and deattenuated Pearson correlation coefficients between FFQ1 and the average of two recalls (validity) and between FFQ1 and FFQ2 (reliability).SettingOntario, Canada.SubjectsA random population-based sample (n = 166) of women aged 25 to 74 years.ResultsOne hundred and fifteen (69%) women completed FFQ1, 96 completed FFQ1 and both recalls, and 93 completed both FFQs, about 56 days apart. Mean intakes were similar for most nutrients. FFQ reliability was high, with Pearson correlation coefficients having a median of 0.75, ranging from 0.57 to 0.90 (macronutrients) and from 0.65 to 0.88 (micronutrients from supplements and food). FFQ validity was moderate to high, with deattenuated Pearson correlation coefficients having a median of 0.59, ranging from 0.11 to 0.73 (macronutrients) and from 0.50 to 0.76 (micronutrients from supplements and food). Our micronutrient correlations were similar to or higher than those of other studies that included supplements. Two correlations <0.40 were associated with fats.ConclusionsThe validity and reliability of this full-diet version of the Block FFQ were moderate to high, supporting its use in future studies among Canadian women.
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Kamath, Suneel Deepak. "Disparities in government and nonprofit organization funding may hinder clinical trial development for underfunded cancers." Journal of Clinical Oncology 39, no. 15_suppl (May 20, 2021): 1573. http://dx.doi.org/10.1200/jco.2021.39.15_suppl.1573.

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1573 Background: National Cancer Institute (NCI) and nonprofit organization (NPO) funding is critical for research and advocacy, but may not be equitable across cancers. This could negatively impact clinical trial development for underfunded cancers. Methods: This study evaluated funding from the NCI and NPOs with > $5 million in annual revenue supporting leukemia, lymphoma, melanoma, lung, breast, colorectal, pancreatic, hepatobiliary, prostate, ovarian, cervical and endometrial cancers from 2015-2018 based on publically available reports and tax records. The primary objectives were to assess for disparities in NCI and NPO funding across different cancers compared to their median incidence and mortality from 2015-2018, and to determine if underfunding correlates with fewer clinical trials found in clinicaltrials.gov. Correlations between combined NCI and NPO funding for each cancer and its incidence, mortality and number of clinical trials were evaluated using descriptive statistics and Pearson correlation coefficients. Results: Diseases with the largest combined NCI+NPO funding were breast ($3.75 billion), leukemia ($1.99 billion) and lung cancer ($1.56 billion). Those with the least funding were endometrial ($94 million), cervical ($292 million), and hepatobiliary cancers ($348 million). These data are summarized in the Table. Disease-specific NCI+NPO funding correlated well with incidence, but less so with mortality (Pearson correlation coefficients: 0.74 and 0.63, respectively). Disease-specific NPO funding correlated moderately well with incidence, but was poorly correlated with mortality (Pearson correlation coefficients: 0.54 and 0.39, respectively). Breast cancer, leukemia and lymphoma were consistently well-funded compared to their incidence and mortality, while colorectal, lung, hepatobiliary and uterine cancers were consistently underfunded. The amount of NCI funding, NPO funding and combined NCI+NPO funding for a particular cancer each correlated strongly with the number of clinical trials for that disease (Pearson correlation coefficients: 0.88, 0.87 and 0.91, respectively). Conclusions: Many cancers with high incidence and mortality are underfunded. Cancers with higher mortality rates receive less funding, particularly from NPOs. Underfunding strongly correlates with fewer clinical trials, which could impede future advances in underfunded cancers.[Table: see text]
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Dissertations / Theses on the topic "Pearson Correlation Coefficients"

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Kalaitzis, Angelos. "Bitcoin - Monero analysis: Pearson and Spearman correlation coefficients of cryptocurrencies." Thesis, Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-41402.

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In this thesis, an analysis of Bitcoin, Monero price and volatility is conducted with respect to S&P500 and the VIX index. Moreover using Python, we computed correlation coefficients of nine cryptocurrencies with two different approaches: Pearson and Spearman from July 2016 -July 2018. Moreover the Pearson correlation coefficient was computed for each year from July2016 - July 2017 - July 2018. It has been concluded that in 2016 the correlation between the selected cryptocurrencies was very weak - almost none, but in 2017 the correlation increased and became moderate positive. In 2018, almost all of the cryptocurrencies were highly correlated. For example, from January until July of 2018, the Bitcoin - Monero correlation was 0.86 and Bitcoin - Ethereum was 0.82.
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Clerot, Davi Delgado. "Verificação de assinaturas off-line utilizando o coeficiente de correlação de Pearson." Universidade Federal de Pernambuco, 2014. https://repositorio.ufpe.br/handle/123456789/17074.

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Submitted by Fabio Sobreira Campos da Costa (fabio.sobreira@ufpe.br) on 2016-06-13T13:50:41Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação - Davi Delgado Clerot - UFPE.pdf: 1275511 bytes, checksum: 8413259c0fde19c85569221d062625a8 (MD5)
Made available in DSpace on 2016-06-13T13:50:41Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação - Davi Delgado Clerot - UFPE.pdf: 1275511 bytes, checksum: 8413259c0fde19c85569221d062625a8 (MD5) Previous issue date: 2014-04-28
No âmbito da biometria comportamental, o reconhecimento automático de assinaturas manuscritas off-line se destaca pela boa aceitação em diversos segmentos, tais como Bancos, Cartórios e Imobiliárias. Dentre os fatores que estimulam sua utilização estão a facilidade na aquisição, pois não depende de equipamentos específicos, e seu valor legal ao ser realizada de próprio punho. No intuito de investigar métodos alternativos para realizar sua verificação automática, esta dissertação testa uma abordagem baseada no Coeficiente de Correlação de Pearson. O experimento foi realizado em seis etapas; da primeira à terceira, são utilizadas variações na extração de características, sem o auxílio de um classificador baseado em aprendizado automático. No quarto experimento, foi utilizada uma rede neural artificial como classificador, para efeito de comparação com os resultados anteriores. No quinto experimento, um peso associado ao limiar de resposta utilizado nos experimentos anteriores foi adicionado objetivando minimizar efeitos dos falsos positivos obtidos. No sexto e último experimento, para efeito de comparação com trabalhos relacionados, foi utilizada a base de dados disponibilizada no ICDAR (Conferência Internacional em Reconhecimento e Análise de Documentos) 2011. A configuração empregada nesta etapa, a qual utilizou a base do ICDAR, foi a do melhor experimento realizado dentre os anteriores. Os métodos propostos apresentaram resultados promissores em comparação com os resultados apresentados na literatura.
In the field of behavioral biometrics, automatic off-line handwritten signature recognition stands out for its widespread acceptance in different market segments, such as Banks, Civil Registry Offices and Real State Agencies. Among the reasons why its use is widely stimulated are its ease of acquisition, once it does not depend on specific equipment, and its legal value when it is done by the author’s own handwriting. With the purpose of searching for alternative methods to proceed to its automatic verification, this essay tests out an approach based on Pearson Correlation Coefficient. The experiment was carried out through six steps; from the first to the third ones, there were used variations for feature extraction, without the assistance of a learning classifier. In the fourth experiment, there was used an artificial neural network as a classifier, in order to compare its results with those obtained in the previous tests. In the fifth experiment, a weight associated to the threshold results obtained in the previous experiments was added, so as to minimize the false positive rate. In the sixth and last experiment, for comparison with related essays, there was used the ICDAR (International Conference on Document Analysis and Recognition) 2011 database. The configuration utilized in this last step was the one obtained in the best test among the previous ones. The proposed methods presented promising results compared to others reported in the literature.
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Bergamaschi, Denise Pimentel. "Correlação intraclasse de Pearson para pares repetidos: comparação entre dois estimadores." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/6/6132/tde-01102014-105050/.

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Objetivo. Comparar, teórica e empiricamente, dois estimadores do coeficiente de correlação intraclasse momento-produto de Pearson para pares repetidos Pi. O primeiro é o estimador \"natural\", obtido mediante a correlação momento-produto de Pearson para membros de uma mesma classe (rI) e o segundo, obtido como função de componentes de variância (icc). Métodos. Comparação teórica e empírica dos parâmetros e estimadores. A comparação teórica envolve duas definições do coeficiente de correlação intraclasse PI como medida de confiabilidade (*), para o caso de duas réplicas, assim como uma apresentação da técnica de análise de variância e a definição e interpretação dos estimadores ri e icc. A comparação empírica é realizada mediante um estudo de simulação Monte Carlo com a geração de pares de valores correlacionados segundo o coeficiente de correlação intraclasse, momento-produto de Pearson para pares repetidos. Os pares de valores são distribuídos segundo uma distribuição Normal bivariada, com valores do tamanho da amostra e da correlação intraclasse previamente fixados em: n= 15, 30 e 45 e pI = {O; 0,15; 0,30; 0,45; 0,60; 0,75; 0,9}. Resultados. Comparando-se o vício e o erro quadrático médio dos estimadores, bem como as amplitudes dos intervalos de confiança, tem-se como resultado que o vício de icc foi sempre menor que o vício de rI, mesmo ocorrendo com o erro quadrático médio. Conclusões. O icc é um estimador melhor, principalmente para n pequeno (por exemplo 15). Para valores maiores de n (30 ou mais), os estimadores produzem resultados iguais até a segunda casa decimal.
Objective. This thesis presents and compares, theoretically and empirically, two estimators of the intraclass correlation coefficient pI, defined as Pearson\'s pairwise intraclass correlation coefficient. The first is the \"natural\" estimator, obtained by Pearson\'s moment-product correlation for members of one class (rI) while the second was obtained as a function of components of variance (icc). Methods. Theoretical and empirical comparison of the parameters and estimators are performed. The theoretical comparison involves two definitions of the intrac1ass correlation coefficient pI as a measure of reliability (*) for two repeated measurements in the same class and the presentation of the technique of analysis of variance, as well as for the definition and interpretation of the estimators ri and icc. The empirical comparison was carried out by means of a Monte Carlo simulation study of pairs of correlated values according Pearson\'s pairwise correlation. The pairs of values follow a normal bivariate distribution, with correlation values and sample size previously fixed: n= 15, 30 e 45 and Pl = . Results. Bias and mean square error for the estimators were compared as well as the range of the intervals of confidence. The comparison shows that the bias of icc is always smaller than of rI This also applies to the mean square error. Conclusions. The icc is a better estimator, especially for n less than or equal to 15. For larger samples sízes (n 30 or more), the estimators produce results that are equal to the second decimal place. (*) Fórmula
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Fernandes, Catarina Marques. "Liderança de empoderamento e trabalho digno." Master's thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/24511.

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O conceito de trabalho digno foi legitimado pela Organização Internacional do Trabalho em 1999, procurando dar resposta a questões no âmbito das políticas internacionais relacionadas com o trabalho. Devido às recentes mudanças no contexto organizacional, a liderança de empoderamento tem adquirido destaque na investigação e na prática. O objetivo do presente estudo é analisar a relação entre o trabalho digno e a liderança de empoderamento e de que forma as dimensões dos dois conceitos se associam. Os dados foram recolhidos através de dois questionários, o Decent Work Questionnaire e o Empowering Leadership Questionnaire, aplicados a 901 trabalhadores portugueses. Os dados foram analisados através do coeficiente de correlação de Pearson, cujos resultados indicaram que as correlações no geral são elevadas e que a dimensão Princípios e valores fundamentais no trabalho do trabalho digno e as dimensões Participação na tomada de decisão, Coaching e Demonstração de preocupação/interação com a equipa pertencentes à liderança de empoderamento são as que apresentam as correlações mais elevadas. Estes resultados demonstram a associação entre trabalho digno e a liderança de empoderamento, sugerindo que são conceitos com forte relação, embora distintos entre si;Empowering Leardership and Decent Work Abstract: The concept of decent work was legitimized by the International Labor Organization in 1999, seeking to address issues in international labor-related policies. Due to recent changes in the organizational context, empowering leadership has gained prominence in research and practice. The aim of the present study is to analyze the relationship between decent work and empowering leadership and how the dimensions of the two concepts are associated. Data were collected through two questionnaires, the Decent Work Questionnaire and the Empowering Leadership Questionnaire, applied to 901 Portuguese workers. The data were analyzed using Pearson's correlation coefficient, whose results indicated that the correlations are generally high and that the dimension Principles and fundamental values in decent work work and the dimensions Participation in decision making, Coaching and Demonstration of concern / interaction with the team belonging to the empowering leadership are those with the highest correlations. These results demonstrate the association between decent work and empowering leadership, suggesting that these concepts are strongly related, although different from each other.
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Truong, Thi Kim Tien. "Grandes déviations précises pour des statistiques de test." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2057/document.

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Cette thèse concerne l’étude de grandes déviations précises pour deux statistiques de test:le coefficient de corrélation empirique de Pearson et la statistique de Moran.Les deux premiers chapitres sont consacrés à des rappels sur les grandes déviations précises et sur la méthode de Laplace qui seront utilisés par la suite. Par la suite, nous étudions les grandes déviations précises pour des coefficients de Pearson empiriques qui sont définis par:$r_n=\sum_{i=1}^n(X_i-\bar X_n)(Y_i-\bar Y_n)/\sqrt{\sum_{i=1}(X_i-\bar X_n)^2 \sum_{i=1}(Y_i-\bar Y_n)^2}$ ou, quand les espérances sont connues, $\tilde r_n=\sum_{i=1}^n(X_i-\mathbb E(X))(Y_i-\mathbb E(Y))/\sqrt{\sum_{i=1}(X_i-\mathbb E(X))^2 \sum_{i=1}(Y_i-\mathbb E(Y))^2} \, .$. Notre cadre est celui d’échantillons (Xi, Yi) ayant une distribution sphérique ou une distribution gaussienne. Dans chaque cas, le schéma de preuve suit celui de Bercu et al.Par la suite, nous considérons la statistique de Moran $T_n=\frac{1}{n}\sum_{k=1}^n\log\frac{X_i}{\bar X_n}+\gamma \, ,$o\`u $\gamma$, où γ est la constante d’ Euler. Enfin l’appendice est consacré aux preuves de résultats techniques
This thesis focuses on the study of Sharp large deviations (SLD) for two test statistics:the Pearson’s empirical correlation coefficient and the Moran statistic.The two first chapters aim to recall general results on SLD principles and Laplace’s methodsused in the sequel. Then we study the SLD of empirical Pearson coefficients, name $r_n=\sum_{i=1}^n(X_i-\bar X_n)(Y_i-\bar Y_n)/\sqrt{\sum_{i=1}(X_i-\bar X_n)^2 \sum_{i=1}(Y_i-\bar Y_n)^2}$ and when the meansare known,$\tilde r_n=\sum_{i=1}^n(X_i-\mathbb E(X))(Y_i-\mathbb E(Y))/\sqrt{\sum_{i=1}(X_i-\mathbb E(X))^2 \sum_{i=1}(Y_i-\mathbb E(Y))^2} \, .$ .Our framework takes place in two cases of random sample (Xi, Yi): spherical distributionand Gaussian distribution. In each case, we follow the scheme of Bercu et al. Next, westate SLD for the Moran statistic $T_n=\frac{1}{n}\sum_{k=1}^n\log\frac{X_i}{\bar X_n}+\gamma \, ,$o\`u $\gamma$ , where γ is the Euler constant.Finally the appendix is devoted to some technical results
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Johansson, Emilia. "Factors controlling the sorption of Cs, Ni and U in soil : A statistical analysis with experimental sorption data of caesium, nickel and uranium in soils from the Laxemar area." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-281938.

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In the fall of 2006, soils from three small valleys in the Laxemar/Oskarshamn area were sampled. A total of eight composite samples were characterized for a number of soil parameters that are important for geochemical sorption and were later also used in batch sorption experiments. Solid/liquid partition coefficients (Kd values) were then determined for seven radionuclides in each of the eight samples. To contribute to the interpretation of the sorption results together with the soil characterizations, this study aims to describe the sorption behavior of the radionuclides caesium, nickel and uranium and also discern which parameters that could provide a basis for estimating the strength of sorption of radionuclides in general. The methodology included quantitative methodologies such as compilation of chemical equilibrium diagrams by the software Hydra/Medusa and correlation analyses using the statistical software SPSS statistics. Based on the speciation diagrams of each radionuclide and identified important linear and non-linear relationships of the Kd values with a number of soil parameters, the following soil- and soil solution properties were found to have controlled the sorption of Cs, Ni and U, respectively, in the Laxemar soils. Cs: the specific surface area of the soil coupled to the clay content. Ni: the cation exchange capacity, alkaline solution pH, soil organic matter and dissolved organic matter. U: the cation exchange capacity, soil organic matter, dissolved organic matter, dissolved carbonate and alkaline solution pH. The soil that showed the strongest sorption varied between the nuclides, which can be related to the individual sorption behavior of caesium, nickel and uranium, as well as the different physicochemical properties of the soils. The parameters that should be prioritized in characterizations of soil samples are identified to be: solution pH, the cation exchange capacity, the specific surface area of the soil, soil organic matter and soil texture (clay content).
För att kunna fatta beslut relaterade till hypotetisk framtida kontaminering från slutförvar av radioaktivt avfall är det direkt avgörande att förstå mobiliteten av radioaktiva element i miljön. Sorption är en av de viktigaste kemiska mekanismerna som kan minska spridningen av radionuklider i vatten/jord/bergssystem, där nukliderna fördelar sig mellan vätskefasen och ytor på fasta partiklar i dessa system. Fördelningskoefficienter (Kd värden) används generellt som ett kvantitativt mått på sorptionen, där ett högt Kd värde innebär att en större andel av ämnet i fråga är bundet till den fasta fasen. Under hösten 2006 togs jordprover från tre dalgångar i Laxemar/Oskarshamn. Totalt åtta jordprover karakteriserades för ett antal jordparametrar som är viktiga för geokemisk sorption och användes senare i batchförsök tillsammans med ett naturligt grundvatten. Fördelningskoefficienter (Kd värden) bestämdes för sju radionuklider (Cs, Eu, I, Ni, Np, Sr and U) för vart och ett av de åtta jordproverna. För att bidra till tolkningen av sorptionsresultaten tillsammans med jordprovernas egenskaper syftar denna studie till att beskriva sorptionsbeteendet hos radionukliderna caesium, nickel och uran samt urskilja vilka parametrar som kan fungera som grund för att uppskatta sorptionsstyrkan av radionuklider i allmänhet. För att uppnå detta syfte så har studien följande mål. Identifiera de jord- och marklösningsegenskaper som kontrollerar sorptionen av Cs, Ni respektive U i de åtta Laxemar proverna. Bestämma vilket Laxemar-jordprov som starkast sorberar de tre radionukliderna. Identifiera de jordparametrar som bör prioriteras vid jordkarakteriseringar, baserat på deras sorptionsinflytande, för att kunna uppskatta Kd värden endast med begränsad information om ett jordsystem. Metoden innefattade kvantitativa metoder såsom sammanställning av kemiska jämviktsdiagram med programvaran Hydra/Medusa och korrelationsanalyser med hjälp av statistikprogramvaran SPSS statistics. De kemiska jämviktsdiagrammen bidrog till att beskriva specieringen av respektive nuklid som en funktion av pH och korrelationsanalyserna bidrog till att identifiera linjära samband mellan par av variabler, tex mellan Kd och jordparametrar. Baserat på specieringsdiagrammen för varje radionuklid och identifierade viktiga linjära och icke-linjära förhållanden mellan Kd-värdena och ett antal jordparametrar har följande egenskaper hos jordarna och marklösningen visat sig huvudsakligen kontrollera sorptionen av Cs, Ni respektive U i de åtta Laxemar jordarna: För caesium gäller jordens specifika ytarea kopplad till lerinnehållet, medan för nickel är det katjonbytarkapaciteten, organiskt material, alkaliska pH-värden samt löst organiskt material. Sorptionen av uran befanns kontrolleras av katjonbytarkapaciteten, organiskt material, löst organiskt material, alkaliska pH-värden samt lösta karbonater. Den jord som visade starkast sorption varierar mellan de tre nukliderna, vilket kan relateras till nuklidernas individuella sorptionsbeteende i jord samt jordarnas olika fysikaliska och kemiska egenskaper. Parametrarna som bör prioriteras vid karaktärisering av jordprov identifierades vara: pH, katjonbytarkapaciteten, jordens specifika ytarea, mängden organiskt material samt jordtexturen (lerinnehåll).
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Lima, Leonardo da Silva e. "Centralidades em redes espaciais urbanas e localização de atividades econômicas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/122524.

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Nos últimos anos, o estudo de propriedades de redes espaciais urbanas conhecidas como centralidades, tem sido utilizado com frequência para descrever fenômenos de ordem sócio-econômica associados à forma da cidade. Autores têm sugerido que centralidades são capazes de descrever a estrutura espacial urbana (KRAFTA, 1994; ANAS et al., 1998) e, portanto através do estudo de centralidades, é possível reconhecer os espaços que mais concentram fluxos, os que possuem os maiores valores de renda da terra, os mais seguros, entre outros aspectos que parecem estar diretamente relacionados com o fenômeno urbano. A hipótese dessa pesquisa admite que centralidades em redes espaciais urbanas desempenham um papel fundamental na formação da estrutura espacial urbana e na maneira como são organizados os usos do solo da cidade. Assim, essa pesquisa investiga qual modelo de centralidade, processado sobre diversas formas de se descrever o espaço urbano na forma de uma rede, é capaz de apresentar resultados mais fortemente correlacionados com a distribuição espacial de atividades econômicas urbanas. Nessa pesquisa são avaliados cinco modelos de centralidade, aplicados sobre diferentes redes espaciais urbanas com a intenção de se verificar qual deles apresenta maior correlação com a ocorrência de atividades econômicas. Para realizar tal exercício, esses modelos são aplicados sobre três tipos de redes espaciais urbanas (axial, nodal e trechos de rua) – oriundas da configuração espacial de três cidades brasileiras – processados de forma geométrica e topológica. Os modelos de centralidade aplicados são conhecidos como centralidade por Alcance (SEVTSUK; 2010), centralidade por Excentricidade (PORTA et al.; 2009, 2011), centralidade por Intermediação (FREEMAN, 1977), centralidade por Intermediação Planar (KRAFTA, 1994) e centralidade por Proximidade (INGRAM, 1971). O coeficiente de correlação Pearson (r) é utilizado como ferramenta capaz de descrever qual modelo de centralidade, associado a qual tipo de representação espacial e qual modo de processamento de distâncias melhor se correlaciona com a distribuição de atividades econômicas urbanas nessas cidades. As evidências encontradas nessa pesquisa sugerem que os modelos de centralidade por Alcance, centralidade por Excentricidade e centralidade por Intermediação Planar destacam-se em comparação com os demais modelos processados. Além disso, os valores de correlação Pearson (r) mais relevantes foram obtidos quando os modelos de centralidade foram processados considerando-se a geometria da rede formada por trechos de rua, indicando que um tipo de representação espacial mais desagregada e processada de forma geométrica seria mais capaz de apresentar os melhores valores de correlação para a compreensão do fenômeno urbano estudado.
In recent years, the study of urban spatial networks has been often used to describe urban phenomena associated with the shape of the city. Researches suggested that centralities are able to describe the urban spatial structure (KRAFTA, 1994; ANAS et al., 1998) and then it is possible to recognize the spaces with more flows, which have the highest values of land revenue, the safest, among other aspects related to urban phenomenon. The hypothesis of this research accepts that centrality in urban spatial networks play a key role for the urban spatial structure and the way of land uses is organized. Thus, there would be some measures of centrality in urban spatial networks that would be more associated with economic activities occurring in the city. The research will evaluate five measures of centrality applied on three types of urban spatial networks (axial map, node map and segment map). Therefore we will use five models of centrality in urban spatial networks known as reach (SEVTSUK, MEKONNEN, 2012), straightness (PORTA et al., 2006b), betweenness (FREEMAN, 1977), planar betweenness (KRAFTA, 1994) and closeness (INGRAM, 1971) in order to determine which this most highly correlated with the occurrence of economic activities. The relationships between these measures of centrality and locations of economic activities are examined in three Brazilian cities, using as methodology the Pearson correlation coefficient (r). The highest correlation between the results of centrality in urban spatial networks and the location of economic activities will suggest which centrality measure, way of to describe urban space like a network and distance processing method (euclidian or topologic) is more associated with the occurrence of these activities in the city. The results indicate that Reach, Straightness and Planar Betweenness are most outstanding models of centrality. In addition, Pearson correlation coefficients (r) most relevant were obtained when models of centrality are processed considering euclidian paths in the street segments network, suggesting that this type of spatial network and distances processing method generates centralities with more significant correlation values within the urban phenomenon studied.
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Čupr, Jiří. "Uplatnění statistických metod při zpracování dat." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2016. http://www.nusl.cz/ntk/nusl-241174.

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This master's thesis is focused on problem of orders of ingredients in McDonald's. It's an analysis of usage changes depending on outside temperature. Thesis includes theoretical background for correct analysis of the problem and possibilities to figuring it out. There is also an algorithmus for more efficient solution of problem with needs or excess of ingredients. There is also a program written in VBA language, that makes more simple usage of this algorithm on restaurants.
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Kasianenko, Stanislav. "Predicting Software Defectiveness by Mining Software Repositories." Thesis, Linnéuniversitetet, Institutionen för datavetenskap och medieteknik (DM), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-78729.

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One of the important aims of the continuous software development process is to localize and remove all existing program bugs as fast as possible. Such goal is highly related to software engineering and defectiveness estimation. Many big companies started to store source code in software repositories as the later grew in popularity. These repositories usually include static source code as well as detailed data for defects in software units. This allows analyzing all the data without interrupting programing process. The main problem of large, complex software is impossibility to control everything manually while the price of the error can be very high. This might result in developers missing defects on testing stage and increase of maintenance cost. The general research goal is to find a way of predicting future software defectiveness with high precision. Reducing maintenance and development costs will contribute to reduce the time-to-market and increase software quality. To address the problem of estimating residual defects an approach was found to predict residual defectiveness of a software by the means of machine learning. For a prime machine learning algorithm, a regression decision tree was chosen as a simple and reliable solution. Data for this tree is extracted from static source code repository and divided into two parts: software metrics and defect data. Software metrics are formed from static code and defect data is extracted from reported issues in the repository. In addition to already reported bugs, they are augmented with unreported bugs found on “discussions” section in repository and parsed by a natural language processor. Metrics were filtered to remove ones, that were not related to defect data by applying correlation algorithm. Remaining metrics were weighted to use the most correlated combination as a training set for the decision tree. As a result, built decision tree model allows to forecast defectiveness with 89% chance for the particular product. This experiment was conducted using GitHub repository on a Java project and predicted number of possible bugs in a single file (Java class). The experiment resulted in designed method for predicting possible defectiveness from a static code of a single big (more than 1000 files) software version.
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Kovařík, Tomáš. "Řízení poslechových testů pro subjektivní hodnocení kvality audio signálu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219467.

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The point of this thesis was to perform listening tests. Appropriate methods of performance were selected for these tests, tests were carried out and the data were analyzed using statistical analysis. Then was compiled the resulting interval scale from results of the first test and in the second listening test were determined average values SNR for background noises.
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Books on the topic "Pearson Correlation Coefficients"

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Sloan, Luke, and Rob Angell. Pearson's Correlation Coefficient and the UK Living Cost and Food Survey (2010): The Relationship Between Income and Expenditure. 1 Oliver's Yard, 55 City Road, London EC1Y 1SP United Kingdom: SAGE Publications, Ltd., 2015. http://dx.doi.org/10.4135/9781473937994.

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Streiner, David L., Geoffrey R. Norman, and John Cairney. Reliability. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199685219.003.0008.

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This chapter reviews the basic theory of reliability, and examines the relation between reliability and measurement error. It derives the standard form of reliability, the intraclass correlation or ICC, from repeated measures ANOVA. The chapter explores issues in the application of the reliability coefficient, including absolute versus relative reliability, the reliability of multiple observations, and the standard error of measurement. It examines several other measures of reliability—Cohen’s kappa, Pearson r, and the method of Altman and Bland—and derives the relation between them and the ICC. The chapter determines the variance of a reliability estimate. It also calculates sample size estimates for reliability studies, and methods to combine reliability estimates in systematic reviews.
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Pearson's Correlation Coefficient and the Global Health Observatory Data (2012): Disaster Preparedness and Food Safety. 1 Oliver's Yard, 55 City Road, London EC1Y 1SP United Kingdom: SAGE Publications, Ltd., 2015. http://dx.doi.org/10.4135/9781473948167.

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Pearson’s Correlation Coefficient and the Early Childhood Longitudinal Study (1998): Reading and Math Performance in Kindergarten. 1 Oliver's Yard, 55 City Road, London EC1Y 1SP United Kingdom: SAGE Publications, Ltd., 2015. http://dx.doi.org/10.4135/9781473942950.

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Pearson’s Correlation Coefficient and the U.S. Statistical Abstracts (2012): Poverty and Infant Mortality Across the U.S. 1 Oliver's Yard, 55 City Road, London EC1Y 1SP United Kingdom: SAGE Publications, Ltd., 2015. http://dx.doi.org/10.4135/9781473947405.

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Pearson's Correlation Coefficient and the Integrated Postsecondary Education Data System (2012): Graduation Rates by Type of College. 1 Oliver's Yard, 55 City Road, London EC1Y 1SP United Kingdom: SAGE Publications, Ltd., 2015. http://dx.doi.org/10.4135/9781473937901.

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Pearson’s Correlation Coefficient and the Consolidated State Performance Report (2012–2013): High School Science Proficiency across the U.S. States. 1 Oliver’s Yard, 55 City Road, London EC1Y 1SP United Kingdom: SAGE Publications, Ltd., 2015. http://dx.doi.org/10.4135/9781473960596.

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Book chapters on the topic "Pearson Correlation Coefficients"

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Hong, Sun-Kyong, Myeong-Seon Gil, and Yang-Sae Moon. "Secure Computation of Pearson Correlation Coefficients for High-Quality Data Analytics." In Database Systems for Advanced Applications, 89–98. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91455-8_8.

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Phillips, Taylor, Chris GauthierDickey, and Ramki Thurimella. "Using Transitivity to Increase the Accuracy of Sample-Based Pearson Correlation Coefficients." In Data Warehousing and Knowledge Discovery, 157–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15105-7_13.

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Matsumoto, T., Y. Fuchita, K. Ichikawa, Y. Fukuda, N. Takemura, and K. Sakatani. "Gender and Age Analyses of NIRS/STAI Pearson Correlation Coefficients at Resting State." In Advances in Experimental Medicine and Biology, 281–87. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-3023-4_35.

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Gooch, Jan W. "Pearson Correlation Coefficient." In Encyclopedic Dictionary of Polymers, 990. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_15317.

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Benesty, Jacob, Jingdong Chen, Yiteng Huang, and Israel Cohen. "Pearson Correlation Coefficient." In Noise Reduction in Speech Processing, 1–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-00296-0_5.

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Wang, Jiguang. "Pearson Correlation Coefficient." In Encyclopedia of Systems Biology, 1671. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-9863-7_372.

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Nahler, Gerhard. "Pearson correlation coefficient." In Dictionary of Pharmaceutical Medicine, 132. Vienna: Springer Vienna, 2009. http://dx.doi.org/10.1007/978-3-211-89836-9_1025.

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Yockey, Ronald D. "The Pearson r Correlation Coefficient." In SPSS® Demystified, 156–63. Third edition. | New York, NY : Routledge, 2017.: Routledge, 2018. http://dx.doi.org/10.4324/9781315268545-14.

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Patten, Mildred L., and Michelle Newhart. "The Pearson Correlation Coefficient (r)." In Understanding Research Methods, 231–35. Tenth edition. | New York, NY : Routledge, 2017.: Routledge, 2017. http://dx.doi.org/10.4324/9781315213033-75.

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Ashoor, Asmaa Shaker, and Ali Abdul Karim Kazem Naji. "Integrated Network of Pearson Correlation Coefficients, Kendall Tau, Spearman Rho and Its Impact on Disease, Health Indicators and Mortality Ratings in Babil Province." In Advances in Intelligent Systems and Computing, 83–96. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4389-4_8.

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Conference papers on the topic "Pearson Correlation Coefficients"

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Van Do, Luong, and Duong Tuan Anh. "Some improvements for time series subsequence join based on pearson correlation coefficients." In SoICT '16: Seventh International Symposium on Information and Communication Technology. New York, NY, USA: ACM, 2016. http://dx.doi.org/10.1145/3011077.3011086.

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Butryn, Krzysztof, and Edward Preweda. "Analysis of the Impact of Quantitative and Qualitative Price-setting Attributes on a Market of Real Estate Intended for the Purpose of the Transformer Stations on the Example of Krakow." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.177.

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Based on appraisal reports, obtained from the City Office of Krakow, there were formulated base of real estate properties on which is situated the building of transformer station or which are intended for such purpose. The base consists of 90 properties located in the administrative boundaries of the city of Krakow. Most of these properties are the plots of very small areas, mainly in the range from 30 to 70 square meters. Based on the completed database, there were conducted a statistical analysis of the relevant market the property. In order to determine the relationship between the attributes and the price of real estate, there were calculated coefficients of the Pearson complete correlation and coefficients of the Spearman correlation. The analysis showed significant differences between quantitative and qualitative correlation coefficients for some variables. In order to improve the consistency of the database, using statistical methods eliminated property turned out. Finally, the analysis considered two bases, numbering respectively 90 and 77 real estates. In the following values, there were defined standardized regression coefficients (scale 9), the partial correlation coefficients for the dependent variable (price) relative to the rest of variables and coefficients of determination. On the basis of calculations and analysis, there have been drawn conclusions on the impact of each attribute on the market prices of these unusual properties.
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Chen, Xinyu, Yanrui Guo, Jiaoyun Yang, Hongtu Chen, and Ning An. "Building a Real Time Plantar Force Measurement Sensor With LC Resonator." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70227.

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The development of wearable equipment is posing new challenges to traditional sensors. Currently, it is important to reduce sensor size and improve sensor sensitivity so that data could be collected without interfering users’ common behavior. This article illustrates a new method for real time plantar force measurement. By paralleling planar inductive sensing coils with capacitors to form a LC resonant circuit and monitoring the change of resonant frequency or inductance, the occurrence of heel-strike and toe-off could be detected, because the change of the clearances between foot and insole triggers the simultaneous alternation of coil inductance. We conducted experiments on two different types of coils and compared them with force sensitive resistor (FSR). It is found that the Pearson correlation coefficients of these two coils’ inductance with the output voltage of FSR conversion circuit are −0.9780 and −0.7788, respectively. With smaller size and less expensive than traditional resistive sensors, this new sensing system could precisely reflect different gaits of walkers when tested in realistic situations.
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Liu, Jing, Yong Zhang, and Qinjun Zhao. "Adaptive ViBe Algorithm Based on Pearson Correlation Coefficient." In 2019 Chinese Automation Congress (CAC). IEEE, 2019. http://dx.doi.org/10.1109/cac48633.2019.8997209.

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Liu, Jing, Yong Zhang, and Qinjun Zhao. "Video stabilization algorithm based on Pearson correlation coefficient." In 2019 International Conference on Advanced Mechatronic Systems (ICAMechS). IEEE, 2019. http://dx.doi.org/10.1109/icamechs.2019.8861649.

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Mujahid, Adnan K. R., and Chandrasegar Thirumalai. "Pearson Correlation Coefficient Analysis (PCCA) on Adenoma carcinoma cancer." In 2017 International Conference on Trends in Electronics and Informatics (ICOEI). IEEE, 2017. http://dx.doi.org/10.1109/icoei.2017.8300976.

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"Fuzzy-weighted Pearson Correlation Coefficient for Collaborative Recommender Systems." In 15th International Conference on Enterprise Information Systems. SciTePress - Science and and Technology Publications, 2013. http://dx.doi.org/10.5220/0004412404090414.

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Logoglu, K. Berker, and Tugrul K. Ates. "Speeding-up Pearson Correlation Coefficient calculation on graphical processing units." In 2010 IEEE 18th Signal Processing and Communications Applications Conference (SIU). IEEE, 2010. http://dx.doi.org/10.1109/siu.2010.5654411.

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Singh, Perminderjit, and K. S. Sangwan. "Product and Process Characteristics for Green Manufacturing: Evidence From Indian SMEs." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34077.

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With growing awareness of environmental issues — from global warming to local waste disposal — business and government have come under increasing pressure to reduce the environmental impacts involved in the production and consumption of goods and services. However, organizations consider environmental assessment fairly late in the product development process, which generates additional design constraints and increases the development costs. The integration of environmental requirements through life-cycle stages of a product is a likely approach, leading to a new paradigm of green manufacturing. Empirical studies by various authors have indicated that Small and Medium Enterprises (SMEs) find it difficult to implement environmental issues in product and process design because of lack of time, resources, expertise and/or framework in comparison to large enterprises. This paper presents the results of an empirical study carried out on Indian SMEs to develop product and process characteristics of green manufacturing. Fifteen product and four process characteristics have been developed to be considered during the product and process design to address the environmental issues for the life cycle of the product. These characteristics provide an easy to use self assessment framework to the SMEs to address the various environmental issues during the product and process design. The characteristics identified from the literature have been validated by using SPSS for Windows statistical tool. The reliability and validity of the data has been assessed by the Cronbach alpha and factor analysis respectively. The results provide sure evidence that the developed characteristics are highly reliable having Cronbach alpha values more than 0.9. Factor loading values for all characteristics are above 0.6, which shows the high validity of the data. A high value of Pearson correlation coefficients also reflects the high correlation among the developed characteristics. The study highlights the various environmental issues to be considered by the SMEs during the product design and development phase.
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Lesina, Mario, and Lovorka Gotal Dmitrovic. "APPLICATION OF SPC AND GROWTH MODELS ON THE ECONOMIC TRAJECTORY OF THE LEATHER AND FOOTWEAR INDUSTRY." In NORDSCI International Conference. SAIMA Consult Ltd, 2020. http://dx.doi.org/10.32008/nordsci2020/b2/v3/01.

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The paper shows the relation among the number of small, medium and large companies in the leather and footwear industry in Croatia, as well as the relation among the number of their employees by means of the Spearman and Pearson correlation coefficient. The data were collected during 21 years. The warning zone and the risk zone were determined by means of the Statistical Process Control (SPC) for a certain number of small, medium and large companies in the leather and footwear industry in Croatia. Growth models, based on externalities, models based on research and development and the AK models were applied for the analysis of the obtained research results. The paper shows using the correlation coefficients that The relation between the number of large companies and their number of employees is the strongest, i.e. large companies have the best structured work places. The relation between the number of medium companies and the number of their employees is a bit weaker, while there is no relation in small companies. This is best described by growth models based on externalities, in which growth generates the increase in human capital, i.e. the growth of the level of knowledge and skills in the entire economy, but also deductively in companies on microeconomic level. These models also recognize the limit of accumulated knowledge after which growth may be expected. The absence of growth in small companies results from an insufficient level of human capital and failure to reach its limit level which could generate growth. According to Statistical Process Control (SPC), control charts, as well as regression models, it is clear that the most cost-effective investment is the investment into medium companies. The paper demonstrates the disadvantages in small, medium and large companies in the leather and footwear industry in Croatia. Small companies often emerge too quickly and disappear too easily owing to the employment of administrative staff instead of professional production staff. As the models emphasize, companies need to invest into their employees and employ good production staff. Investment and support to the medium companies not only strengthens the companies which have a well-arranged technological process and a good systematization of work places, but this also helps large companies, as there is a strong correlation between the number of medium and large companies.
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Reports on the topic "Pearson Correlation Coefficients"

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Arthur, Jennifer Ann. Pearson correlation coefficients applied to correlated physics of fission. Office of Scientific and Technical Information (OSTI), April 2018. http://dx.doi.org/10.2172/1434422.

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Labonte, M., and F. Goodarzi. The Relationship Between Dendographs and Pearson Product - Moment Correlation Coefficients. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/122500.

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Duvvuri, Sarvani, and Srinivas S. Pulugurtha. Researching Relationships between Truck Travel Time Performance Measures and On-Network and Off-Network Characteristics. Mineta Transportation Institute, July 2021. http://dx.doi.org/10.31979/mti.2021.1946.

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Trucks serve significant amount of freight tonnage and are more susceptible to complex interactions with other vehicles in a traffic stream. While traffic congestion continues to be a significant ‘highway’ problem, delays in truck travel result in loss of revenue to the trucking companies. There is a significant research on the traffic congestion mitigation, but a very few studies focused on data exclusive to trucks. This research is aimed at a regional-level analysis of truck travel time data to identify roads for improving mobility and reducing congestion for truck traffic. The objectives of the research are to compute and evaluate the truck travel time performance measures (by time of the day and day of the week) and use selected truck travel time performance measures to examine their correlation with on-network and off-network characteristics. Truck travel time data for the year 2019 were obtained and processed at the link level for Mecklenburg County, Wake County, and Buncombe County, NC. Various truck travel time performance measures were computed by time of the day and day of the week. Pearson correlation coefficient analysis was performed to select the average travel time (ATT), planning time index (PTI), travel time index (TTI), and buffer time index (BTI) for further analysis. On-network characteristics such as the speed limit, reference speed, annual average daily traffic (AADT), and the number of through lanes were extracted for each link. Similarly, off-network characteristics such as land use and demographic data in the near vicinity of each selected link were captured using 0.25 miles and 0.50 miles as buffer widths. The relationships between the selected truck travel time performance measures and on-network and off-network characteristics were then analyzed using Pearson correlation coefficient analysis. The results indicate that urban areas, high-volume roads, and principal arterial roads are positively correlated with the truck travel time performance measures. Further, the presence of agricultural, light commercial, heavy commercial, light industrial, single-family residential, multi-family residential, office, transportation, and medical land uses increase the truck travel time performance measures (decrease the operational performance). The methodological approach and findings can be used in identifying potential areas to serve as truck priority zones and for planning decentralized delivery locations.
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