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Mar 31, 2016 9:21 AM
(1577 views)

If you run a similar test like Tukey's JMP generates a "connecting letters report." However our data is non-normal and the variances are heterogeneous so we needed to use the Kruskal-Wallis test to examine variance and then used Steel-Dwass to compare means for all pairs of treatments. How can we get a similar letters report after doing this analysis?

Thanks,

Zach

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Jul 4, 2016 10:01 PM
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Jul 7, 2016 5:08 AM
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Jul 7, 2016 7:31 AM
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It appears there is no way built-in to the program, and I am not savvy with coding (hence using JMP instead of SAS). I imagine SAS has more options for this but I switched to JMP because of the ease of use. Depending on your data it may be fine to simply run an ANOVA and use Tukey's or similar if you can correct the variance with a tranformation or rely on the Welch ANOVA if not.

Turns out the assumption of normality does not always have to be met:

Experiments in Ecology, by A.J. Underwood. 2006. Cambridge University Press (pages 192-193)