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Dissertations / Theses on the topic 'Optimum sample size'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Hathaway, John Ellis. "Determining the Optimum Number of Increments in Composite Sampling." BYU ScholarsArchive, 2005. https://scholarsarchive.byu.edu/etd/425.

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Composite sampling can be more cost effective than simple random sampling. This paper considers how to determine the optimum number of increments to use in composite sampling. Composite sampling terminology and theory are outlined and a model is developed which accounts for different sources of variation in compositing and data analysis. This model is used to define and understand the process of determining the optimum number of increments that should be used in forming a composite. The blending variance is shown to have a smaller range of possible values than previously reported when estimati

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2

Feijó, Sandra. "Técnicas para execução de experimentos sob ambiente protegido para a cultura da abobrinha italiana." Universidade Federal de Santa Maria, 2005. http://repositorio.ufsm.br/handle/1/3178.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>In order to determinate technicals to execution trials in protected environments for italian pumpkin was accomplished an experiment, from 18/08/2003 to 07/12/2003, in the area of the Department of Fitotecnia UFSM, in plastic greenhouse, with four rows and each row consisted of twenty-four plants. A total of twenty-seven harvests were made, evaluating fruit weight with length ≥15cm. The sample soil was sampled before accomplishment the experiment; one sample point is equal to four sub sample. The Smith heterogeneity index was e

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Medeiros, José António Amaro Correia. "Optimal sample size for assessing bacterioneuston structural diversity." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/10901.

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Mestrado em Biologia Aplicada - Microbiologia Clínica e Ambiental<br>The surface microlayer (SML) is located at the interface atmospherehydrosphere and is theoretically defined as the top millimeter of the water column. However, the SML is operationally defined according to the sampling method used and the thickness varies with weather conditions and organic matter content, among other factors. The SML is a very dynamic compartment of the water column involved in the process of transport of materials between the hydrosphere and the atmosphere. Bacterial communities inhabiting the SML (b

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Thach, Chau Thuy. "Self-designing optimal group sequential clinical trials /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/9585.

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5

Takazawa, Akira. "Optimal decision criteria for the study design and sample size of a biomarker-driven phase III trial." Kyoto University, 2020. http://hdl.handle.net/2433/253492.

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6

Fitton, N. V. "Why and How to Report Distributions of Optima in Experiments on Heuristic Algorithms." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1006054556.

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7

Brungard, Colby W. "Alternative Sampling and Analysis Methods for Digital Soil Mapping in Southwestern Utah." DigitalCommons@USU, 2009. http://digitalcommons.usu.edu/etd/472.

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Digital soil mapping (DSM) relies on quantitative relationships between easily measured environmental covariates and field and laboratory data. We applied innovative sampling and inference techniques to predict the distribution of soil attributes, taxonomic classes, and dominant vegetation across a 30,000-ha complex Great Basin landscape in southwestern Utah. This arid rangeland was characterized by rugged topography, diverse vegetation, and intricate geology. Environmental covariates calculated from digital elevation models (DEM) and spectral satellite data were used to represent factors cont

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Kothawade, Manish. "A Bayesian Method for Planning Reliability Demonstration Tests for Multi-Component Systems." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416154538.

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9

Vong, Camille. "Model-Based Optimization of Clinical Trial Designs." Doctoral thesis, Uppsala universitet, Institutionen för farmaceutisk biovetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-233445.

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General attrition rates in drug development pipeline have been recognized as a necessity to shift gears towards new methodologies that allow earlier and correct decisions, and the optimal use of all information accrued throughout the process. The quantitative science of pharmacometrics using pharmacokinetic-pharmacodynamic models was identified as one of the strategies core to this renaissance. Coupled with Optimal Design (OD), they constitute together an attractive toolkit to usher more rapidly and successfully new agents to marketing approval. The general aim of this thesis was to investigat

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10

Her, Chi-Way, and 何淇瑋. "The Optimal Sample Size For Interval Estimation Of Correlation Coefficient." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/20731985747790441131.

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碩士<br>國立交通大學<br>管理科學系所<br>99<br>As the degree of correlation between two variables is one of concern to many social science issues, thus using the sample correlation coefficient to infer population correlation coefficient is a common method. However, the decision of the optimum sample size for the entire study will save a lot of time and cost. Traditionally, the sample size determination in addition to hypothesis testing method, this research will introduce the expected interval length method and the expected interval coverage probability method. Expected interval coverage probability method i

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11

Susarla, Hari Krishna. "Optimal sample size determination in seed health testing : a simulation study." Thesis, 2005. http://spectrum.library.concordia.ca/8582/1/MR10215.pdf.

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Selection of an appropriate sample size is an important prerequisite to any statistical investigation. In this thesis the problem of identifying the sample size for testing the seed health by noting the presence or the absence of pathogen(s) is considered. The cross-classified data of variety by seed by pathogen is collected for the purpose, which consists of N observations for each variety of seed. Here N is regarded as population size and the outcome is a Bernoulli random variable. A simulation method for identifying the sample size is developed and is compared with five existing methods. Th

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12

Tai, Chih-Ying, and 戴志穎. "Optimal Sample Size Allocation for a Series System under Accelerated Life Tests." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/527r7d.

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碩士<br>國立中央大學<br>統計研究所<br>105<br>In accelerated life tests of system reliability, the sample size allocation under different stress levels could affect the accuracy of the reliability inference. Given three stress levels of an accelerated variable, this thesis tackles the issue on the optimal allocation of an accelerated life test of series systems. It turns out that the objective functions frequently are of the form of the product of second elementary symmetric functions. We fist derive the sufficient condition when the optimal plan is reduced to a two-level test with equal sample size allocat

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13

Lin, Wan-Chin, and 林琬津. "Optimal Sample Sizes for Behrens-Fisher Problem—with Allocation Constraints." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/99881721817606352291.

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碩士<br>中原大學<br>應用數學研究所<br>98<br>The Behrens–Fisher problem is the problem concerning the mean differences between two normally distributed populations and assuming that the variances of the two populations are unequal or unknown, based on two independent samples. In the thesis, we consider using Welch‘s t test to evaluate power to find optimal sample sizes. First, adjusting the test statistic as exact distribution and adjusting the critical value as a function of Beta distribution. Second, discussing that what are the two optimal sample sizes required to attain the specified power level. The fi

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14

Lee, I.-Chen, and 李宜真. "Optimal Sample Size Allocation for Accelerated Degradation Test (Based on Exponential Dispersion Model)." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/15800875410986355797.

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碩士<br>國立清華大學<br>統計學研究所<br>99<br>Accelerated Degradation tests (ADTs) are widely used to assess the lifetime information of highly reliable products possessing quality characteristics that both degrade over time and can be related to reliability. Hence, how to design an efficient ADT plan for assessing product’s lifetime information at normal-use stress (especially for the optimal sample-size allocation to higher test-stress levels) turns out to be a challenging issue for reliability analysts. In the literature, several papers had addressed this decision problem. However, the results are only b

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15

Wen, Yu-Ju, and 溫鈺如. "A Study on Optimal Sample Size for Destructive Inspection under Bayesian Sequential Sampling Plan." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/09774408609859024071.

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碩士<br>國立屏東科技大學<br>工業管理系<br>94<br>In this paper, we focus our attention on sample size for destructive inspection, and consider inspection cost and cost of sampling error, we applied Bayesian estimation model to derive the posterior pdf of P. We formulated a mathematical model for expected total losses. Applying computerized numerical analysis method, we can find out the optimal sample size that minimize the total losses. Furthermore, we use the concept of sequential sampling, the decision-maker can draw a sample , and inspect it in each sequential observation, and to determine whether to stop

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陳玟穎. "Optimal Sample Size Allocation for Accelerated Degradation Test (based on Exponential Dispersion Model andV-optimality Criterion)." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/18501934393076313934.

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碩士<br>國立清華大學<br>統計學研究所<br>100<br>Accelerated degradation test (ADT) is widely used to assess the lifetime information (e.g.,p-thquantileor mean-time-to-failure (MTTF))of highly reliable products. Hence,it is a challenging issue for reliabilityengineer to plan an efficientADT test. Recently, Lee (2011) proposedan exponential-dispersion accelerated degradation (EDAD) model and derived the analyticalsolution of optimal sample-size allocation. The advantage of this resultis that EDAD model covers well-knownmodels such as Wiener, Gamma and Inverse Gaussian accelerated degradation model. However, th

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17

Huang, Chia-De, and 黃嘉德. "Optimal Sample Sizes for Behrens-Fisher Problem Based on Power and Cost Considerations." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/38011428035543720963.

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碩士<br>中原大學<br>應用數學研究所<br>98<br>Abstract Two groups are normal distribution. The mean and variance of two groups are unknown. The question is how to test the mean of two groups which is called Behrens – Fisher problem. This paper mainly applies Lee’s method in 1992, we use the power function which have exact t distribution to replace the original power function. Using the power function to find the best numbers that is concerning of two kinds problem about the cost and numbers. One kind consider the restriction of power to find the numbers which have the minimum cost, another is consider the re

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18

Cheng, Yu-Chieh, and 鄭宇傑. "Optimal Sample Sizes for Behrens-Fisher Problem Based on Precision and Cost Considerations." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/22253431304170858803.

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碩士<br>中原大學<br>應用數學研究所<br>98<br>This paper mainly researches the Behrens-Fisher problem on the confidence interval for the difference of two normal population means, according to precision of confidence interval and the unit cost considerations, to discuss the selection of optimal sample size. Using the approximate t statistic of the Welch approximate t test obtained though the change of variable to derive the precision of the calculated formula is main method to this. There are two topics for the research, one is that the sample size choosing of the lowest total cost which is under the restric

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19

"Optimal sample size allocation for multi-level stress testing with extreme value regression under type-I censoring." 2012. http://library.cuhk.edu.hk/record=b5549162.

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在多組壽命試驗中，為了準確地估計模型的參數，我們必須找出最合適的實驗品數量，以分配給每一個應力水平。近來, Ng, Chan and Balakrishnan(2006)，在完整樣本情況下，利用「極值回歸模型」發展了找尋實驗品數量最合適的分配方法。其後，Ka, Chan, Ng and Balakrishnan (2011)在同一個回歸模型下，研究了對於「II型截尾樣本」最合適的分配方法。因為我們仍未確立對「I型截尾樣本」的最合適分配方法，所以我們將會在本篇論文中探討如何在「I型截尾壽命試驗」中找出最合適的實驗品分配方法。<br>在本論文中，我們會利用最大似然估計的方法去估計模型參數。我們也會計算出「逆費雪訊息矩陣」(「漸近方差協方差矩陣」)I⁻¹，用以量度參數估計值的準確度。以下是三個對最合適分配方法的決定準則:<br>1.費雪訊息矩陣的行列式最大化,<br>2. ν1估計值的方差最小化, var( ν1)(V -優化準則 )<br>3.漸近方差協方差矩陣的跡最小化, tr(⁻¹)(A-優化準則 )<br>我們也會討論在「極值回歸模型」的特例：「指數回歸模型」之下最合適的分配方法。<br>In multi-group life-testing experiment, it is essential to optimize the allocation of the items u

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20

Lin, Tin-Han, and 林廷翰. "Optimal Sample Size Allocation for Accelerated Life Test with Multiple Levels of Stress under Location-Scale Distributions." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/22qm9x.

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碩士<br>淡江大學<br>數學學系數學與數據科學碩士班<br>106<br>Accelerated life test is widely used to assess the lifetime information (e.g., p-th quantile or mean-time-to-failure (MTTF)) of the highly reliable products. Hence, how to design an efficient accelerated life test plan for assessing the product’s lifetime information at normal-use stress such as the optimal sample-size allocation turns out to be a challenging issue for reliability analysts. In this paper, motivated by a mylar-polyurethane data, we first proposed an accelerated life model that random error is a location-scale distribution. Next, by using t

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21

Teng, Zhaoyang. "Optimal and adaptive designs for multi-regional clinical trials with regional consistency requirement." Thesis, 2015. https://hdl.handle.net/2144/15706.

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To shorten the time for drug development and regulatory approval, a growing number of clinical trials are being conducted in multiple regions simultaneously. One of the challenges to multi-regional clinical trials (MRCT) is how to utilize the data obtained from other regions within the entire trial to help make local approval decisions. In addition to the global efficacy, the evidence of consistency in treatment effects between the local region and the entire trial is usually required for regional approval. In recent years, a number of statistical models and consistency criteria have been prop

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22

Hewes, Bailey. "An Investigation of the Optimal Sample Size, Relationship between Existing Tests and Performance, and New Recommended Specifications for Flexible Base Courses in Texas." Thesis, 2013. http://hdl.handle.net/1969.1/149371.

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The purpose of this study was to improve flexible base course performance within the state of Texas while reducing TxDOT’s testing burden. The focus of this study was to revise the current specification with the intent of providing a “performance related” specification while optimizing sample sizes and testing frequencies based on material variability. A literature review yielded information on base course variability within and outside the state of Texas, and on what tests other states, and Canada, are currently using to characterize flexible base performance. A sampling and testing progra

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23

Wang, Hsien-Cheng, and 王獻正. "On Some Determinations of the Critical Values and Optimal Sample Sizes for the Process Capability Indices Cpm and Cpp." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/43876756311350292145.

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碩士<br>淡江大學<br>統計學系<br>90<br>In recent years, process capability indices (PCI’s) have been applied in the quality control by most practitioners, that are used to assess the ability of a production process whether is capable. However, these practitioners usually simply look at the value if the estimates calculate from the sample data and then make a conclusion on whether the given process meets the capability requirement. This approach is not appropriate, since sampling errors have been ignored and estimates of process indices are point estimates. However, a more appropriate estimate would be pr

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