Question: 9. 2 In Exercise &. 2. a proportional hazards model was fit to d` study of the survival of rats implanted with Fisk Elioma Co

9. 2 In Exercise &. 2. a proportional hazards model was fit to d` study of the survival of rats implanted with Fisk Elioma Co brains . Three groups of rats were considered : control rats . radiation only, and rats given radiation plus BPA. Using an ` Act of time_ dependent covariates, test that the hazard rates ` LIQUIDS are promotional

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