1. Select "Statistics | Advanced Models | Survival | Comparing two samples" (Note if more than two groups are involved, select "Comparing multiple samples" instead).



2. Check examples in the Statistica Electronic Manual or this link: Comparing Survival in Two or More Groups 

For instance, to get plots in an example comparing two groups, select the plot under "Function Plots" tab in the results dialog.



Note: This analysis module requires data of the two groups to be stacked in the long view. Check heart.sta data (in Statistica Example Datasets folder) used in the above example for reference.
More information about how to specify the variables can be found here.

When multiple samples are compared, click "Summary " under the Multiple Groups Results dialog to get the chi-square results for the multiple comparison. Note: this result is also shown on the top part of the result dialog.

The two sample and multiple sample tests used in the survival analysis module are explained here.

More information about Survival Analysis module in Statistica can be found here.