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Inferences on the within‐subject coefficient of variation
Author(s) -
Tian Lili
Publication year - 2005
Publication title -
statistics in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.996
H-Index - 183
eISSN - 1097-0258
pISSN - 0277-6715
DOI - 10.1002/sim.2330
Subject(s) - coefficient of variation , statistics , confidence interval , term (time) , variation (astronomy) , measure (data warehouse) , sample (material) , computer science , reproducibility , sample size determination , mathematics , subject (documents) , econometrics , data mining , physics , chemistry , chromatography , quantum mechanics , astrophysics , library science
The within‐subject coefficient of variation (WCV) is widely used as a measure of precision and reproducibility of data in medical and biological science. In this paper, generalized confidence intervals and tests for a single WCV is developed using the concept of generalized pivots under the assumption of one‐way random effect model. This approach is further extended to two‐sample cases. The resulting procedures are easy to compute and have good properties in term of coverage probabilities and type‐I error control at small sample sizes. The proposed methods are illustrated by a real life example. Copyright © 2005 John Wiley & Sons, Ltd.