Subgroups (Complex Samples Cox Regression)

Baseline Strata. A separate baseline hazard and survival function is computed for each value of this variable, while a single set of model coefficients is estimated across strata.

Subpopulation Variable. Specify a variable to define a subpopulation. The analysis is performed only for the selected category of the subpopulation variable.

How To Define Subgroups

This feature requires the Complex Samples option.

1. From the menus choose:

   Analyze > Complex Samples > Cox Regression...

2. Select a plan file. Optionally, select a custom joint probabilities file and then click Continue.
3. In the Complex Samples Cox Regression dialog box, click the Subgroups tab.