title: Distribution-free regression analysis of grouped survival data.
abstract: Methods based on regression models for logarithmic hazard functions, Cox models, are given for analysis of grouped and censored survival data. By making an approximation it is possible to obtain explicitly a maximum likelihood function involving only the regression parameters. This likelihood function is a convenient analog to Cox's partial likelihood for ungrouped data. The method is applied to data from a toxicological experiment.
mesh_terms: D000818:Animals; D005399:Fishes; D009026:Mortality; D011336:Probability; D012044:Regression Analysis; D013223:Statistics as Topic; D015032:Zinc / Q000633:toxicity
chemical_list: D015032:Zinc