Odds ratios

[Susanbwh]

Hi John:
I just want to understand the term ORs. In logistic regression, we have ORs as effect size, correct? And also, we can calculate ORs based on a 2x2 table. So, apparently, these two are different in terms of how they are calculated. But we can still use these terms? Thank you.

 

[JohnM]

Yes, odds ratios are analogous to "effect size" and can be interpreted in the same way for logistic regression and for 2x2 tables.

I believe they're computed the same way in both logistic regression and contingency tables - they're simply the ratio of two odds.