We are going to fit a cox proportional hazards regression model to our data set srv. dt2. we have two covariates that we are interested in: a continuous measurement score and a category group with three levels.
(a) we start by using the group variable which has three levels: a, b, and c. here is the output from the r codeanalyzing r output (cox proportional hazards regrewhat would we conclude from the likelihood ratio test? (b) what would we conclude from the likelihood ratio test? (b) in the above output, the coefficients for group b and group c are given along with their standard errors. what information does that give us regarding the relationship between the failure time and the groupings in this study? be specific.(c) we want to control for the level of the score measurement. here is the output from some relevant proportional hazards models: is it important to include the score covariate in our model? why or why not? (d) how does including the score covariate change our conclusion? calculate the appropriate likelihood ratio test and p value for testing the effect of the groups on the failure time. what do we conclude?