Krall, Uthoff, and Harley (1975) analyzed data from a study on multiple myeloma in which researchers treated 65 patients with alkylating agents.
Of those patients, 48 died during the study and 17 survived. In the data set MYELOMA, the variable TIME represents the survival time in months from diagnosis. The variable VSTATUS consists of two values, 0 and 1, indicating whether the patient was alive or dead, respectively, at the of end the study. If the value of VSTATUS is 0, the corresponding value of TIME is censored.
The variables thought to be related to survival are LOGBUN (log BUN at diagnosis), HGB (hemoglobin at diagnosis), PLATELET (platelets at diagnosis: 0=abnormal, 1=normal), AGE (age at diagnosis in years), LOGWBC (log WBC at diagnosis), FRAC (fractures at diagnosis: 0=none, 1=present), LOGPBM (log percentage of plasma cells in bone marrow), PROTEIN (proteinuria at diagnosis), and SCALC (serum calcium at diagnosis).
Data are from
http://ftp.sas.com/techsup/download/sample/samp_lib/
statsampExamples_of_Coxs_Model.html
data(myeloma)A data frame containing 65 observations on 11 variables:
| [,1] | "time" |
| [,2] | "vstatus" |
| [,3] | "logBUN" |
| [,4] | "HGB" |
| [,5] | "platelet" |
| [,6] | "age" |
| [,7] | "logWBC" |
| [,8] | "FRAC" |
| [,9] | "logPBM" |
| [,10] | "protein" |
| [,11] | "SCALC" |
Krall, J.M., Uthoff, V.A., and Harley, J. B. (1975). A Step-up Procedure for Selecting Variables Associated with Survival. Biometrics, 31, 49-57.