D. Commenges and H. Jacqmin-Gadda (1997, J. Roy. Statist. Soc. B59, 157-171) considered generalized score tests of homogeneity that accommodate parametric and semiparametric regression models arising from multivariate random effects with common variance and known correlations. In this paper we...

It is a common situation in biomedical research that one or more variables are known to be associated with the outcome of interest. Researchers often discretize some variables and fit a regression model using these discretized variables. Although convenient for illustration purposes, such an...