Hi,
I was wondering if anybody can help me.
My data failed the levenes test (ANOVA) so I applied the Kruskal Wallis
non-parametric test. There were significant differences, so now I want to know
where those differences lie by doing the Mann Whitney U test. I have 24 groups
to compare with 3 reps in each group. Therefore, I would ideally like to apply
a bonferroni correction to my Mann whitney test to avoid a type 1 error.
I have written my syntax like this:
NPAR TESTS
/MANN-WHITNEY = TotalCu BY byPlot (1, 5)
/POSTHOC={BONFERRONI, ALPHA ([0.0020833])}
but I get an error message like this:
.17-23: error: Syntax error at 'POSTHOC': expecting end of command.
/POSTHOC
Does anybody know what it is that I am doing wrong?
Can you apply a Bonferroni correction to Mann whitney in PSPP? If yes, how? If
not, is there an alternative option?
I have tried doing mann whitney for each and every pair of groups without the
bonferroni correction and everything comes out significant. When I know that it
shouldn't
Jen
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