SURVIVAL ANALYSIS Techniques for Censored and Truncated Data Second Edition John P. Klein Melvin L. Moeschberger Exercise 11.6

(a)For the data on survival times of patients with an aneuploid or diploid DNA tumor profile in Exercise 4 determine which, if any, observations are outliers by making an appropriate deviance resid- ual plot. (b) Findthethreepointsthathavethegreatestinfluenceontheestimate of the regression effect by constructing a plot of the adjusted score residuals. Explain why these three points are so influential in light of your fitted regression model.

Use the "tongue" dataset in the "KMsurv" package in R

https://cran.r-project.org/web/packages/KMsurv/KMsurv.pdf