title: Piecewise comparison of survival functions in stratified proportional hazards models.
abstract: 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.
authors.affiliation: Statistical Research Unit, University of Copenhagen, Denmark.
authors.forename: D
authors.initials: D
authors.lastname: Kronborg
authors.forename: P
authors.initials: P
authors.lastname: Aaby
mesh_terms: D001699:Biometry; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008457:Measles / Q000401:mortality; D016016:Proportional Hazards Models; D012044:Regression Analysis; D016019:Survival Analysis