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Tests of proportional hazards and proportional odds models for grouped survival data
E A Colosimo1, L V Chalita, C G Demétrio
1Departamento de Estatística, ICEx/UFMG, Caixa Postal 702, 30161-970, Belo Horizonte-MG, Brazil. enricoc@est.ufmg.br
Biometrics
|December 29, 2000
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.