Higher-moment approaches to approximate interval estimation for a certain intraclass correlation coefficient
✍ Scribed by Kelly H. Zou; Michael P. McDermott
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 102 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0277-6715
No coin nor oath required. For personal study only.
✦ Synopsis
We consider the problem of constructing a con"dence interval for the intraclass correlation coe$cient in an interrater reliability study when the raters are assumed to be randomly selected from a population of raters. A Monte Carlo simulation study is conducted to investigate the true coverage probabilities of the commonly used intervals proposed by Fleiss and Shrout, which rely on Satterthwaite's two-moment approximation. These intervals are shown to be substantially anticonservative in certain cases. We propose intervals based on higher-moment approximations obtained using the Pearson system of distributions. The modi"ed intervals are more conservative and generally more satisfactory than those obtained by the two-moment approximation. The competing methods are illustrated using data from a study of the natural history of facioscapulohumeral muscular dystrophy.