A note on the unbiased estimation of the intraclass correlation

John R. Donoghue; Linda M. Collins

doi:10.1007/BF02294749

A note on the unbiased estimation of the intraclass correlation

John R. Donoghue, Linda M. Collins

Global Public Health

Research output: Contribution to journal › Article › peer-review

Abstract

The intraclass correlation, ρ, is a parameter featured in much psychological research. Two commonly used estimators of ρ, the maximum likelihood and least squares estimators, are known to be negatively biased. Olkin and Pratt (1958) derived the minimum variance unbiased estimator of the intraclass correlation, but use of this estimator has apparently been impeded by the lack of a closed form solution. This note briefly reviews the unbiased estimator and gives a FORTRAN 77 subroutine to calculate it.

Original language	English (US)
Pages (from-to)	159-164
Number of pages	6
Journal	Psychometrika
Volume	55
Issue number	1
DOIs	https://doi.org/10.1007/BF02294749
State	Published - Mar 1990

Keywords

FORTRAN
algorithm
hierarchical linear models
intraclass correlation
unbiased estimation

ASJC Scopus subject areas

General Psychology
Applied Mathematics

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10.1007/BF02294749

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A note on the unbiased estimation of the intraclass correlation

Abstract

Keywords

ASJC Scopus subject areas

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