Posted by
J McClure on
Jan 19, 2011; 6:55pm
URL: http://spssx-discussion.165.s1.nabble.com/Bonferroni-correction-and-number-of-comparisons-tp3348337.html
Hi,
I am doing a post hoc analysis comparing column proportions and
adjusting (Bonferroni) for multiple comparisons (CTables, test
statistics option).
I've been asked to provide the corrected p-value.
I'd like to know if I am correct in reporting the corrected value as .008.
The row variable has two levels (yes and no) and the column variable has
4 levels, so I am making 6 comparisons for 'no' and 6 for 'yes'. n*(n-1)/2
The output shows the comparison for the 'no' and for the yes level of
the row variable. Is the Bonferroni adjustment for 6 comparisons and the
corrected p-value (.05/6=.008333)
Also, I have 19 row variables for which I am running column proportion
comparisons. I think that the comparisons for each of the 19 variables
are considered independent from each other so no further adjustment is
made by SPSS. Is this the way reviewers look at the question?
Thanks for any help,
Jan
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