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

Posted by Emet Schneiderman on Oct 14, 2016; 4:41pm
URL: http://spssx-discussion.165.s1.nabble.com/How-does-SPSS-compute-the-Bonferroni-adjusted-alpha-used-in-their-2x2-Chi-square-tests-tp5733251p5733256.html

<quote author="Jon Peck">
You can find the adjustment formula in the Algorithms documentation under
CROSSTABS.  It is based on the subtable in the column proportions test.

Jon - Thanks for pointing me to the documentation.  If I understand it correctly, the Bonferroni corrections are computed on a row by row basis, and do not account for the total number of rows in the contingency table (i.e., treated as independent). For example with a 6x4 contingency table (6 response levels in the rows and 4 groups in columns),  there are 6 possible pairwise comparisons per row, so the adjusted alpha level (threshold) would be 0.00833, (.05/6).  Is this your understanding?