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Dissertations / Theses on the topic 'Kappa coefficient'

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Published: 4 June 2021

Last updated: 28 January 2023

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1

Robin, Stéphane. "Analyse de sensibilite de tests non-parametriques adaptes aux donnees censurees." Paris 5, 1994. http://www.theses.fr/1993PA05S013.

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Quand on veut tester l'efficacite d'un traitement et que la reponse a ce traitement se presente sous la forme d'une duree de vie (eventuellement censuree), on a le plus souvent recours a des tests non-parametriques tels que les tests du logrank pondere. L'utilisation de tels tests repose sur l'hypothese que le traitement a ete attribue au hasard, c'est-a-dire que tous les individus avaient, a priori, la meme probabilite de recevoir le traitement. On propose une methode permettant de repondre a la question : quelle confiance accorder aux resultats d'une telle etude si l'hypothese d'equiprobabil

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2

Bonnardel, Philippe. "Test statistique Kappa : programmation informatique et applications pratiques." Paris 5, 1996. http://www.theses.fr/1996PA05P072.

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3

Xier, Li. "Kappa — A Critical Review." Thesis, Uppsala University, Department of Statistics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-126672.

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<p>The Kappa coefficient is widely used in assessing categorical agreement between two raters or two methods. It can also be extended to more than two raters (methods). When using Kappa, the shortcomings of this coefficient should be not neglected. Bias and prevalence effects lead to paradoxes of Kappa. These problems can be avoided by using some other indexes together, but the solutions of the Kappa problems are not satisfactory. This paper gives a critical survey concerning the Kappa coefficient and gives a real life example. A useful alternative statistical approach, the Rank-invariant me

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4

Hodgson, Lucien Guy, and n/a. "Cotton crop condition assessment using arial video imagery." University of Canberra. Applied Science, 1991. http://erl.canberra.edu.au./public/adt-AUC20060725.144909.

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Cotton crop condition was assessed from an analysis of multispectral aerial video imagery. Visible-near infrared imagery of two cotton fields was collected towards the end of the 1990 crop. The digital analysis was based on image classification, and the accuracies were assessed using the Kappa coefficient of agreement. The earliest of three images proved to be best for distinguishing plant variety. Vegetation index images were better for estimating potential yield than the original multispectral image; so too were multi-channel images that were transformed using vegetation indices or principal

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Dou, Weibei. "Segmentation d'images multispectrales basée surla fusion d'informations : application aux images IRM." Phd thesis, Université de Caen, 2006. http://tel.archives-ouvertes.fr/tel-00111904.

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L'objectif de cette thèse consiste à développer une architecture de<br />fusion d'informations basée sur la théorie floue pour la segmentation<br />d'une cible à partir de plusieurs sources d'images. Notre application<br />principale porte sur la segmentation des images IRM multispectrales. Nous proposons une approche de segmentation automatique basée sur la fusion des caractéristiques extraites de chaque source d'image. Ces caractéristiques sont modélisées par des fonctions d'appartenance, obtenues à partir de fonctions analytiques, qui prennent en compte des connaissances a priori sur la pos

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Dou, Weibei. "Segmentation d'images multispectrales basée sur la fusion d'informations : application aux images IRM." Caen, 2006. http://www.theses.fr/2006CAEN2026.

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L'objectif de cette thèse consiste à développer une architecture de fusion d'informations basée sur la théorie floue pour la segmentation d'une cible à partir de plusieurs sources d'images. Notre application principale porte sur la segmentation des images IRM multispectrales. Nous proposons une approche de segmentation automatique basée sur la fusion des caractéristiques extraites de chaque source d'image. Ces caractéristiques sont modélisées par des fonctions d'appartenance, obtenues à partir de fonctions analytiques, qui prennent en compte des connaissances à priori sur la possibilité d'appa

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7

Silva, Gabriella Cynara Minora da. "Diagn?stico da degrada??o ambiental no munic?pio de Areia Branca-RN por geotecnologias." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/18247.

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Made available in DSpace on 2014-12-17T15:55:04Z (GMT). No. of bitstreams: 1 GabriellaCMS_DISSERT.pdf: 3451606 bytes, checksum: 1ee33015b3633fb79771b6160bff6a6c (MD5) Previous issue date: 2013-02-25<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>The municipality of Areia Branca is within the mesoregion of West Potiguar and within the microregion of Mossor?, covering an area of 357,58 km2. Covering an area of weakness in terms of environmental, housing, together with the municipality of Grossos-RN, the estuary of River Apodi-Mossor?. The municipality of Areia Branca has his

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8

Bier, Vanderlei Artur. "Construção e avaliação de mapas." Universidade Estadual do Oeste do Parana, 2015. http://tede.unioeste.br:8080/tede/handle/tede/256.

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Made available in DSpace on 2017-05-12T14:47:32Z (GMT). No. of bitstreams: 1 Vanterlei _Artur Bier.pdf: 3411579 bytes, checksum: 9d27d1df8109289eb3cf3192d069b831 (MD5) Previous issue date: 2015-02-23<br>The precision agriculture (PA) is defined as the use of site specific management techniques that allow cropping management according to its needs and soil, in order to reduce impacts on the environment. The models valuation that interpolates field data and generates thematic maps is a task that requires in-depth knowledge on this issue. The Cohen Kappa index (K) is the most widely statistics

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9

Cheng, Yu Chun, and 鄭宇君. "Estimation of intraclass correlation coefficient and Kappa statistic in categorical data." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/93387061533488183894.

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10

Lee, Yi-Hsuan, and 李怡萱. "Robust likelihood analysis of the agreement kappa coefficient for paired nominal and paired ordinal data." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/4xd3dc.

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碩士<br>國立中央大學<br>統計研究所<br>106<br>In this paper, we construct a robust likelihood function for the agreement kappa/weighted kappa coefficient for clustered paired data in the case of three-category diagnostic outcome scenario. Utilizing this robust likelihood function, one can construct robust likelihood ratio (LR) statistic and LR-based confidence intervals without specifically modeling the intra-cluster correlation. We also make comparison between our robust likelihood approach and the nonparametric inferential method for kappa with paired data proposed by Yang and Zhou (2014, 2015) via simula

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Cao, Qian. "Interrater Agreement and Reliability of Observed Behaviors: Comparing Percentage Agreement, Kappa, Correlation Coefficient, ICC and G Theory." Thesis, 2013. http://hdl.handle.net/1969.1/149310.

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The study of interrater agreement and itnerrater reliability attract extensive attention, due to the fact that the judgments from multiple raters are subjective and may vary individually. To evaluate interrater agreement and interrater reliability, five different methods or indices are proposed: percentage of agreement, kappa coefficient, the correlation coefficient, intraclass correlation coefficient (ICC), and generalizability (G) theory. In this study, we introduce and discuss the advantages and disadvantages of these methods to evaluate interrater agreement and reliability. Then we review

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12

Lu, Chun-Yaung. "Dynamical simulation of molecular scale systems : methods and applications." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-12-2151.

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Rare-event phenomena are ubiquitous in nature. We propose a new strategy, kappa-dynamics, to model rare event dynamics. In this methodology we only assume that the important rare-event dynamics obey first-order kinetics. Exact rates are not required in the calculation and the reaction path is determined on the fly. kappa-dynamics is highly parallelizable and can be implemented on computer clusters and distributed machines. Theoretical derivations and several examples of atomic scale dynamics are presented. With single-molecule (SM) techniques, the individual molecular process can be resolved w

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13

Chien, Ching-Chang, and 錢慶彰. "Likelihood inference for the equality of two kappa coefficients for correlated binary data." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/m6z984.

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碩士<br>國立中央大學<br>統計研究所<br>107<br>The kappa coefficient is an index that is widely used to measure the agreement between different raters or different methods. In this paper, we construct a robust likelihood function for the quality of two kappa coefficients for correlated paired data in the case of binary diagnostic outcome scenario. Using this robust likelihood function, we can make correct statistical inferences without modeling the correlated joint distribution in paired data. We provide simulations and real data analyses to demonstrate the robust likelihood approach.

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14

Wang, Jung-Feng, and 王榮蜂. "The comparison and extension of weighted-least-squares and generalized estimating equations approaches for dependent kappa coefficients." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/86884922673855432398.

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碩士<br>國立彰化師範大學<br>統計資訊研究所<br>97<br>Many studies in medical, industry and business fields commonly use questionnaires and diagnoses reported by different raters or instruments to evaluate the agreement of multiple ratings. The most popular indices of agreement for a categorical response are the kappa measures, Cohen’s kappa for binary outcomes and weighted kappa for ordinal outcomes (Cohen 1960, 1968). However, when raters assess the same observation on two or more occasions, these ratings are dependent, and, therefore one must take into account the correlation between the kappa estimates for m

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15

Ramaswamy, Shankaran. "Colour Vision Test for Railway Dispatchers." Thesis, 2009. http://hdl.handle.net/10012/4352.

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Introduction Colour codes are used extensively in railways to convey specific information governing movement of trains and equipment on the track. One such task is the railway traffic control display that uses colour coded video display terminals (VDTs) to convey information of the signal status, train movements and track status to the railway dispatcher. Because individuals with colour vision deficiencies (colour-defectives) may have problems with these colour-related tasks, questions were raised about the suitability of colour vision defectives to work as railway dispatchers. In order to ans

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16

(8300103), Shams R. Rahmani. "Digital Soil Mapping of the Purdue Agronomy Center for Research and Education." Thesis, 2020.

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This research work concentrate on developing digital soil maps to support field based plant phenotyping research. We have developed soil organic matter content (OM), cation exchange capacity (CEC), natural soil drainage class, and tile drainage line maps using topographic indices and aerial imagery. Various prediction models (universal kriging, cubist, random forest, C5.0, artificial neural network, and multinomial logistic regression) were used to estimate the soil properties of interest.

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