Having cells with zero when I run the mcc command for McNemar's test

[Adegboyega Ogunwale]

Hi, why do I keep seeing UNEXPOSED CONTROL cells with zero when I run the mcc command for McNemar's test for paired data? I don't get this when I run the mcci command with specific frequencies.

[Tiago Pereira]

Welcome to the Statalist, Adegboyega.

Zero events should have no problem for the Exact McNemar test. Can you provide an example? The community can help you better when an example is available.