**How To Calculate Odds Ratio**. It is calculated as. For my example data the odds of carrying the G1 variant among those with Disease X was 225 4520.

Odds can then be expressed as 5. For 2x2 table factor or matrix oddsratio uses fishertest to compute the odds ratio. How to use the odds ratio calculator.

### One of the simplest ways to calculate an odds ratio is from a cross tabulation table.

Odds ratio two-sided confidence interval left-sided and right-sided confidence interval one-sided p-value and z-score. Ac bd or equivalently. It is calculated as. Odds ratio a c b d Where ab Positive Test Values.