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Heterogeneous Variances in Repeated Measures
Author(s) -
Wu Yuan,
McGilchrist C. A.
Publication year - 1995
Publication title -
biometrical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.108
H-Index - 63
eISSN - 1521-4036
pISSN - 0323-3847
DOI - 10.1002/bimj.4710370503
Subject(s) - statistics , mathematics , variance (accounting) , homogeneous , repeated measures design , enzootic , linear model , econometrics , analysis of variance , biology , combinatorics , virus , accounting , virology , business
A general approach to repeated measures analysis described in MCGILCHRIST and CULLIS (1991) is extended to general linear models in which there is a homogeneous correlation structure such as a stationary process but the variances are heterogeneous over time. Models for the variance heterogeneity are suggested and results are applied to data examining the effect of enzootic pneumonia on young pigs.