The two are almost equivalent, but can differ a bit in how they deal with multiple events occurring at the exact same time (this concept is known as “ties” in the data). To compare two survival curves, Prism has two methods available: Curve comparisons for two survival curves In Prism, these codes can be specified manually, but they must be integer values. However, some institutions use the opposite convention. The default choices are to use the codes “1” to indicate that the event of interest occurred and “0” to indicate that the observation was censored. Simply click on the analysis parameters toolbar button to bring up the dialog. To see the options specified for the analysis, you can access the analysis parameters dialog from the survival analysis results sheet. Prism will use the default options for the analysis and generate the results for you. You don’t need to start an analysis using the Analyze toolbar button or selecting the analysis from the Analyze menu, and you don’t need to specify any options on the analysis parameters dialog. When data are entered into a survival data table, Prism automatically performs the analysis of the data and generates Kaplan-Meier survival curves. The survival analysis is unique among the analyses that Prism offers. Prism analyzes survival data automatically (no need to initiate an analysis manually)

Graphpad prism 5 survival