Pairwise comparison of KM survival curve

Question

Hello JMP community,

I am currently analyzing a dataset that includes the survival of subjects under eight different diets. I conducted a log-rank test and found that there is a significant difference between at least some of the groups. Now, I want to perform post-hoc pairwise comparisons to determine which specific groups differ from one another in terms of survival.

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Attached is a file that contains an example of the data I'm trying to analyze.

can anyone help me, please?

Thanks

Example for JMP community.jmp

Jed_Campbell · Answer

Ah, you can do this in the Fit Y by X platform. To get the Wilcoxon (and other nonparametric) pairwise tests, select the red triangle...Nonparametric...Wilcoxon Each Pair. For more traditional (mean/stdev) pairwise comparisons, select the red triangle...Compare Means...then one of the options (usually student's t or Tukey). I've attached a script to run this to your sample table.

Example for JMP community (2).jmp

CorrelationDeer · Answer

Hi,

thank you so much first of all, but this is not what I'm looking for.

I am interested in comparing the means of survival days between pairs of groups.

this is the plot I get from: Analyze -> Reliability and survival -> Survival -> "Y, Time to event=Survival days" -> "Grouping=Diet"

According to the "Test between groups" there is significant deference:

My goal is to test these differences between each pair of groups (Pairwise comparison?).

I hope I'm clear now and sorry for the confusion :)

Jed_Campbell · Answer

I'm not sure I'm understanding completely what you're looking for, but this sounds a bit like a Reliability problem. With your data table, I used the Fit Life by X platform, assumed a Lognormal distribution, then from the nonparametric overlay plot I could see that White 2 was the only different distribution.

This isn't exactly a pairwise comparison, so I made the Estimates table into a data table and used Graph Builder to show intervals for location and scale, which is more like the pairwise comparison.

Is this what you're looking for?

Estimates.jmp

Example for JMP community (1).jmp

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