Stata Do Files

Kaplan-Meier Analysis Using Stata

Need a data set with one observation per person.

Each person either experiences event or is censored.

Need a variable for the time from study entry to date of event or date of censoring/failure

Need a variable indicating whether follow-up ended with the event or with censoring/failure

TO GRAPH A CURVE FROM THE KAPLAN-MEIER ESTIMATES:

Using command line, type:

. sts graph

Step 3: Graph the curve>

All of preceding can be done in Stata 10 using its pull-down menus.

Statistics

Use Declare data to be survival-time data to identify time and censoring variables and specify value that indicates failure (eg, 1)

Statistics

Use Create survivor, hazard, & other variables to get values of survival function

Use Graph survivor & cumulative hazard functions to get K-M graph

Jeff Martin, MD