versus age. The residual plot will consist of two curves, with the curve of all positive values corresponding to survivors and the negative curve for deaths. As in Chapter 9, residual plots can be...

versus age. The residual plot will consist of two curves, with the curve of all positive values corresponding to survivors and the negative curve for deaths. As in Chapter 9, residual plots can be used to diagnose curvature, but this is quite hard without the aid of a smoother added to the plot.

Fit the logistic regression model y ∼ age + age∧2 + sex + status and summarize results.