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Use this tag for any *on-topic* question that (a) involves `R` either as a critical part of the question or expected answer, & (b) is not *just* about how to use `R`.
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Violating Cochran-Mantel-Haenszel assumption and alternative
In R, I've set up tables like so:
> summary_data
grade exp got count
1 F pre yes 96
2 F pre no 219
3 F post yes 19
4 F post no 93
5 D pre yes 75
6 …