Question: In this problem we are trying to estimate the survival of liver transplant patients using information on the patients collected before the operation. The variables

In this problem we are trying to estimate the survival of liver transplant patients using information on the patients collected before the operation. The variables are:

CLOT: a measure of the clotting potential of the patient's blood, PROG:

The data are given in Table 8.31.

a subjective index of the patient's prospect of recovery, ENZ: a measure

(a) Perform a linear regression for estimating survival times. Plot residuals. Interpret and critique the model used.

(b) Because the distributions of survival times are often quite skewed, a logarithmic model is often used for such data. Perform the regression using such a model. Compare the results with those of part (a).

CLOT: a measure of the clotting potential of the patient's blood, PROG: a subjective index of the patient's prospect of recovery, ENZ: a measure of a protein present in the body, LIV: a measure relating to white blood cell count and the response, and TIME: a measure of the survival time of the patient.

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