A test for serial correlation in univariate repeated-measures analysis.

E. M. Hearne, G. M. Clark, J. P. Hatch

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A popular design in biostatistics and psychometrics is the time-factor experiment involving one grouping factor, e.g. treatment or drug, and one repeated-measures factor, e.g. time or visit. If F tests involving the repeated-measures factor are to be valid, univariate analytic procedures require special assumptions for covariance matrices across groups. The robustness of these univariate procedures is investigated when the covariance matrices do not satisfy these assumptions but have a frequently occurring form, namely the serial correlation or simplex pattern. A table is presented which shows that, for some matrices that fit the pattern, the main-effect repeated-measures estimated actual probability level is more than three times the .05 nominal level. A likelihood ratio test for the serial correlation pattern is presented, along with an example from the field of biostatistics.

Original languageEnglish (US)
Pages (from-to)237-243
Number of pages7
JournalBiometrics
Volume39
Issue number1
StatePublished - Mar 1 1983

ASJC Scopus subject areas

  • Statistics and Probability
  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Agricultural and Biological Sciences(all)
  • Applied Mathematics

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