Tests of proportional hazards and proportional odds models for grouped survival data.
Colosimo E. A., Chalita L. V. A. S., Demétrio C. G. B.
Author Affiliation: Departamento de Estatística, ICEx/UFMG, Caixa Postal 702, 30161-970, Belo Horizonte-MG, Brazil.
Biometrics 56 : 1233-1240
Abstract : In this paper, we derive score test statistics to discriminate between proportional hazards and proportional odds models for grouped survival data. These models are embedded within a power family transformation in order to obtain the score tests. In simple cases, some small-sample results are obtained for the score statistics using Monte Carlo simulations. Score statistics have distributions well approximated by the chi-squared distribution. Real examples illustrate the proposed tests.