Description

Researchers randomly assigned metastatic breast cancer patients to either a control group or a group that received weekly 90 minute sessions of group therapy and self-hypnosis, to see whether the latter treatment improved the patients' quality of life.

Usage

Format

A data frame with 58 observations on the following 3 variables.

Survival

months of survival after beginning of study

Group

a factor with levels "Control" and "Therapy"

Censor

0 if entire lifetime observed, 1 if patient known to have lived at least 122 months

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

References

Spiegel, D., Bloom, J.R., Kraemer, H.C. and Gottheil, E. (1989). Effect of Psychosocial Treatment on Survival of Patients with Metastatic Breast Cancer, Lancet 334(8668): 888–891.

Examples