#StackBounty: #proportion #contingency-tables #mcnemar-test Comparison of proportions using McNemar's Chi-Square using Pre- and Pos…

Bounty: 50

This question follows-up on the post: What is the difference between McNemar’s test and the chi-squared test, and how do you know when to use each?

I am examining a pre- and post- intervention data on two disease conditions. The above post described the use of McNemar’s test for 1 disease before and after an intervention was administered to a sample.

I have two contingency tables, which look like:

            **Disease A**

                After   
                   |no  |yes|
        Before|No  |41  |11 |
              |Yes |32  |39 |

              **Disease B**

               After   
                   |no  |yes|
        Before|No  |41  |11 |
              |Yes |32  |39 |

Question: I would like to compare the proportions of:

(1) Those that went from “Yes” to “No” pre to post for Disease A vs. Disease B

(2) Those that are “Yes” after treatment (“After Yes”/”Total N”) vs. those that are “No” after treatment for Disease A vs. Disease B.

How do I compare the two proportions in the above two questions ?

Again, the data is drawn from the same sample and anyone with Disease A could also be positive for Disease B at the same time. The same intervention is used to treat both A and B.


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