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Reliability of Composite Dichotomous Measurements
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SYSNO ASEP 0353038 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Reliability of Composite Dichotomous Measurements Author(s) Martinková, Patrícia (UIVT-O) SAI, RID, ORCID
Zvára, Karel (UIVT-O)Source Title European Journal for Biomedical Informatics. - : Pulsus Group - ISSN 1801-5603
Roč. 6, č. 2 (2010), s. 103-109Number of pages 7 s. Language eng - English Country CZ - Czech Republic Keywords reliability ; binary data ; logistic regression ; Cronbach alpha ; Rasch model ; myocardial perfusion diagnosis Subject RIV BB - Applied Statistics, Operational Research R&D Projects 1M06014 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z10300504 - UIVT-O (2005-2011) DOI 10.24105/ejbi.2010.06.2.4 Annotation In this paper we examine a more general definition of reliability, which is based on decomposition of variance in mixed effects model. Proposed definition covers the classical definition of reliability and it is, moreover, appropriate for dichotomous measurements, too. Newly, for the proposed definition assumptions are derived, under which the reliability of composite measurement can be predicted by reliability of single measurement (Spearman-Brown formula) and approximate validity of Spearman-Brown formula is shown for the Rasch model. Finally, as a modification of the classical estimate of reliability based on Cronbach's alpha, we examine its counterpart logistic alpha, which appears to be more appropriate for composite dichotomous measurements in some cases. The new estimate is used in binary data of computerized process of myocardial perfusion diagnosis from cardiac single proton emission computed tomography (SPECT). Workplace Institute of Computer Science Contact Tereza Šírová, sirova@cs.cas.cz, Tel.: 266 053 800 Year of Publishing 2011
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