227
Complex Samples Cox Regression
Preparing the Data for Analysis
Before restructuring the data, you willneed to create two ancillary variables to help with the
restructuring.
ETocompute a new variable, from the menus choose:
Transform> Compute Variable...
Figure 22-21
Compute Variable dialog box
EType start_time2 as the target variable.
EType time1 as the numeric expression.
EClick OK.