Abstract
When outcomes are ordered categorical, a model using an ordinal effect size measure is a good alternative of the cumulative logit model to compare several independent group differences. We present a method of constructing simultaneous confidence intervals for the ordinal effect size measures, using the studentized range distribution with the score test statistic. A simulation study shows that the proposed method performs well in terms of coverage probability, and it seems better than the method using a Bonferroni correction for Wald-type statistics and methods that account for the dependencies among pairwise ordinal effect size measures using the multivariate normal distribution (or the multivariate t-distribution for small samples).
Original language | English (US) |
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Pages (from-to) | 3179-3188 |
Number of pages | 10 |
Journal | Statistics in Medicine |
Volume | 28 |
Issue number | 25 |
DOIs | |
State | Published - Nov 10 2009 |
Keywords
- Bonferroni correction
- Ordinal effect size measure
- Score test
- Simultaneous confidence interval
- Studentized range distribution
ASJC Scopus subject areas
- Epidemiology
- Statistics and Probability