Piecewise comparison of survival functions in stratified proportional hazards models.
A numerical test of identity of hazards in Cox's regression model in the case when the observations have been stratified according to some covariate (possibly time-dependent) and the regression coefficient is common to all strata is proposed. The test is applied to analysis of the effect of early exposure to measles.
Kronborg
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Statistical Research Unit, University of Copenhagen, Denmark.
Aaby
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P
D001699:Biometry; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008457:Measles / Q000401:mortality; D016016:Proportional Hazards Models; D012044:Regression Analysis; D016019:Survival Analysis