The Power and Sample Size Application
Additional Topics
Using the Other Survival Curve Forms
Survival functions can be specified as median survival times, hazards, or a combination of hazards for one group and hazard ratios. These all assume exponential curves.
Suppose you are interested in comparing the proposed and existing treatments using their median survival times. The survival times are five years and four years for the two groups, respectively.
Figure 90.90: Median Survival Times and List of Alternate Forms
Click the Survival Functions tab and examine the list of alternate forms available in the Select a form: list. For this example, select the option.
For the example, enter 5 and 4 in the first row of the table. The completed table is shown in Figure 90.90.
You can enter one or more sets of two median survival times. The results of the analysis are not shown.