The data are the survival times (in months) after mastectomy of women with breast cancer. The cancers are classified as having metastasized or not based on a histochemical marker. Censoring is...

The data are the survival times (in months) after mastectomy of women with breast cancer. The cancers are classified as having metastasized or not based on a histochemical marker. Censoring is indicated by the event variable that takes the value TRUE in the case of death and FALSE otherwise. Plot the Kaplan–Meier estimated survival functions for each type of cancer on the same graph and comment on the differences. Use a log-rank test to formally compare the survival experience of each class.