version 10.0 set more on log using Framingham.TimeDependentTest.log, replace * Framingham.TimeDependent.log * * Perform hazard regressions of gender on CHD risk * using age as the time variable. Explore models * with time dependent covariates for sex * set memory 2m use C:\WDDtext\2.20.Framingham.dta, clear generate time= followup/365.25 generate male = sex==1 label define male 0 "Women" 1 "Men" label values male male * * Calculate the relative risk of CHD for men relative to women using * age as the time variable. * generate follow = age+time stset follow, failure(chdfate) stcox male * * Perform hazard regression with time dependent covariates for sex * tabulate chdfate male * * Split each patient's record into one or more records so that each * record describes one epoch with constant covariates for the epoch. * generate exit = follow stset exit, id(id) failure(chdfate) stsplit enter, at(50 60 70 80) generate male1 = male*( exit <= 50) generate male2 = male*(enter >= 50 & exit <= 60) generate male3 = male*(enter >= 60 & exit <= 70) generate male4 = male*(enter >= 70 & exit <= 80) generate male5 = male*(enter >= 80) list id male? enter exit chdfate if id == 924 generate testmale = male1 + male2 + male3 + male4 + male5 tabulate chdfate testmale, missing more stset exit, id(id) enter(time enter) failure(chdfate) stcox male? test male1 = male2 = male3 = male4 = male5 lincom male1 - male2 lincom male2 - male3 lincom male3 - male4 lincom male4 - male5 generate male34 = male3 + male4 summarize male34 stcox male1 male2 male34 male5 test male1 = male2 = male34 = male5 lincom male1 - male2 lincom male2 - male34 lincom male34 - male5 log close