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A Comparison of Confidence Interval Methods for the Intraclass Correlation Coefficient
Allan Donner and George Wells
Vol. 42, No. 2 (Jun., 1986), pp. 401-412
Published by: International Biometric Society
Stable URL: http://www.jstor.org/stable/2531060
Page Count: 12
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Different methods of obtaining confidence intervals for the intraclass correlation coefficient ρ in the unbalanced one-way random-effects model are investigated, focusing on applications to family studies. Methods based on simple modifications of formulas for the case of equal group sizes are found to provide adequate coverage at small to moderate values of ρ. A method based on the large-sample standard error of the sample intraclass correlation, as derived by Smith (1956, Annals of Human Genetics 21, 363-373), is shown to provide consistently good coverage at all values of ρ. A method proposed by Thomas and Hultquist (1978, Annals of Statistics 6, 582-587) also provides consistently good coverage, but generates mean interval widths substantially greater than those generated by Smith's method at values of ρ likely to arise in practice.
Biometrics © 1986 International Biometric Society