Re: How does SPSS compute the Bonferroni adjusted alpha used in their >2x2 Chi-square tests?

Posted by Jon Peck on Oct 13, 2016; 4:35pm
URL: http://spssx-discussion.165.s1.nabble.com/How-does-SPSS-compute-the-Bonferroni-adjusted-alpha-used-in-their-2x2-Chi-square-tests-tp5733251p5733252.html

You can find the adjustment formula in the Algorithms documentation under CROSSTABS.  It is based on the subtable in the column proportions test.

On Thu, Oct 13, 2016 at 8:39 AM, Emet Schneiderman <[hidden email]> wrote:

My question concerns how SPSS v22 does Bonferroni corrections for chi-square
tests on contingency tables > 2x2 (nominal data). For example when doing the
post-hoc pair-wise comparisons between the 4 groups (in columns), are the
adjustments based on just the row or the whole matrix? For the former, the
adjusted alpha level (threshold) would be 0.0083, (.05/6); for the latter it
would seem to be .00167 (.05/30). Which are they using to declare that a
p-value is significant, while preserving the experiment-wise alpha of 0.05?
Their documentation is unclear on this issue.



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