(a) Find the effect of Stagen and Hist upon survival by fitting a log-linear model. Check any assumptions and evaluate the fit using the graphical methods described in this chapter. (b) What happens...

(a) Find the effect of Stagen and Hist upon survival by fitting a log-linear model. Check any assumptions and evaluate the fit using the graphical methods described in this chapter. (b) What happens in part (a) if you include Staget in your model along with Stagen and Hist as predictors of survival?