- Thread starter Menekse
- Start date

Here is it.

Yeah I do not have enough people. But the problem with the data is the outcome is 0 for some outcomes under the same risk factor. So SPSS did not calculate odds ratio for these outcomes and jumped to Risk Estimate which is even harder to understand for me.

Now do you mean I must add 0.5 to all cells even to those which caused 0 outcome on the crosstabs?

Many thanks

There is no attachment button here to send the analysis as I see...

Thank you.

Odds = a / b

They are not the same. If the exposure of interest is rare, then the odds can approximate the risk. Risk is usually used if you have temporality in data (e.g., collect exposure then document subsequent outcome) and odds if data collect retrospectively or via cross-section without knowledge of temporality. Odds and odds ratios get used more frequently since they can be easily generated from logistic regression.