Two-Sample Tests Results

Comparing Samples

Click the OK button in the Comparing Survival in Two Groups dialog box to display the Two-Sample Tests Results dialog box, which contains three tabs: Quick, Two-sample tests, and Function plots.

The options on these tabs are used to compute five different nonparametric tests for comparing the survival function in two groups. Brief descriptions of these methods are provided in the Introductory Overview.

Summary box. The Summary box displays summary information about the current analysis.

Copy button. Click the Copy button to copy either the selected text (if text has been selected) in the Summary box or all of the text (if no text has been selected) to the Clipboard. Note that the copied text retains formatting information (such as font, color, etc.).

Contract/Expand button. Click the Contract/Expand button to contract or expand the Summary box. When contracted, you can see only one line of the Summary box text and can scroll through the text using a scroll bar. Note that when contracted, the text is scrolled so that the first non-blank line is at the top. When expanded (the default setting), the entire Summary box will be displayed.

Gehan test. Click the Gehan test button to display a spreadsheet with the results of Gehan's Wilcoxon test. In addition to the Gehan-Wilcoxon test statistic, the spreadsheet will list all observations (survival times; note that censored observations are marked by a + sign), the group to which each belongs, the number of observations that are smaller than the respective observation (under the column header R1), and the number of observations that are larger than the respective observation (under the column header R2).

Cancel. Click the Cancel button to close the dialog box without performing an analysis and return to the Comparing Survival in Two Groups dialog box.

Options. Click the Options button to display the Options menu.

By Group. Click the By Group button to display the By Group specification dialog box.