Life Distribution - Compare Groups Report
Tip: If you find that the report window is getting too long, select Tabbed Report from the red triangle menu.
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Compare Distributions (no Distribution Profiler)
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The Summary report contains a row for each group and for the combined data. Each row shows the number of units that failed and the numbers that were left, interval, or right censored. Each row also gives the corresponding mean and standard error. For details about how the mean and standard error are computed, see Statistical Reports for Survival Analysis in Survival Analysis.
This report presents results of the Wilcoxon test for equality of the failure functions. The report gives the chi-square approximation, the associated degrees of freedom, and the p-value for the test. A small p-value suggests that the groups differ. For an example, see Wilcoxon Group Homogeneity Test in Fit Life by X. The Wilcoxon test and its generalization to censored data are discussed in Kalbfleisch and Prentice (1980).
The tabs within the Individual Group report contain Life Distribution reports for each individual group. For details about these reports, see Life Distribution Report and Life Distribution Report Options.
Many of the options in the Compare Groups red triangle menu can also be found in the Life Distribution red triangle menu. See Life Distribution Report Options.
Adds an Estimate Probability report corresponding to the most recently selected distribution under Compare Distribution. Enter a value for the Time to Event variable in the text box and press Enter. To add a Time to Event value, click the plus sign. To remove the most recent value, click the minus sign. For further details, see Estimate Probability Report.
(Appears only if Compare Quantile is selected.) Adds an Estimate Quantile report corresponding to the most recently selected distribution under Compare Quantile. Enter a value for the probability of interest in the text box and press Enter. To add a Prob value, click the plus sign. To remove the most recent value, click the minus sign. For each group and probability value, the Time to Event quantile and 95% Wald and Likelihood confidence intervals are shown.