Chi Square the right test?


I have 2 groups of data with yes and no answers at two different time frames.

So for example....
Pre Post
Group 1 Yes No
Group 2 No Yes

I need to find if there is any significance between the groups in the difference between the answers from pre to post. So basically the significance of pre yes answers turning to no post or vice versa. Little confused on what test I should run to solve this?



A repeated measures type logistic regression may suit your needs in which you dummy code the output as 0/1 and use a difference score. THis is one approach but there are other approaches that would work.

EDIT: GM's suggestion is probably more appropriate
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