title: Association between survival time and ordinal covariates.
abstract: An application of the method of rank correlation is proposed for testing independence between a censored survival time and an ordinal covariate. The test statistic counts the number of concordances minus the number of discordances at each time with event(s) and adds across times; it is expressible as a score statistic within the proportional hazards framework. The proposed test includes, as a special case, a generalization of Jonckheere's test against ordered alternatives and as applied to the analysis of categorical data, it can be seen as a generalization of the Mantel-Haenszel procedure.
authors.affiliation: Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis 55455.
authors.forename: C T
authors.initials: CT
authors.lastname: Le
authors.forename: P M
authors.initials: PM
authors.lastname: Grambsch
authors.forename: T A
authors.initials: TA
authors.lastname: Louis
mesh_terms: D000704:Analysis of Variance; D001699:Biometry; D006801:Humans; D016016:Proportional Hazards Models; D013269:Stochastic Processes; D016019:Survival Analysis