Comparison of some homogeneity tests in analysis of over-dispersed binomial data

✍ Scribed by James J. Chen; Hongshik Ahn; K. F. Cheng

• Book ID: 104781121
• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 640 KB
• Volume: 1
• Category: Article
• ISSN: 1352-8505
• DOI: 10.1007/bf00469428

✦ Synopsis

This paper compares the procedures based on the extended quasi-likelihood, pseudo-likelihood and quasilikelihood approaches for testing homogeneity of several proportions for over-dispersed binomial data. The type I error of the Wald tests using the model-based and robust variance estimates, the score test, and the extended quasi-likelihood ratio test (deviance reduction test) were examined by simulation. The extended quasi-likelihood method performs less well when mean responses are close to 1 or 0. The model-based Wald test based on the quasi-likelihood performs the best in maintaining the nominal level. The score test performs less well when the intracluster correlations are large or heterogeneous. In summary: (i) both the quasilikelihood and pseudo-likelihood methods appear to be acceptable but care must be taken when overfitting a variance function with small sample sizes; (ii) the extended quasi-likelihood approach is the least favourable method because its nominal level is much too high; and (iii) the robust variance estimator performs poorly, particularly when the sample size is small.