Contingency analysis - Odds ratio

4 important questions on Contingency analysis - Odds ratio

What can be quantified with the odds ratio?

The ratio/difference of success between two groups.

How is the odds ratio calculated?

The odds of success in one group divided by the odds of success in a second group.

What is the SE and CI for odds ratio calculated from?

From the log-odds ratio.
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Why is the log-odds ratio used to calculate the standard error and CI?

Because the sampling distribution is highly skewed,

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