FAQ/OddsRa62013-03-08 10:17:58localhostconverted to 1.6 markup52009-12-09 10:18:01PeterWatson42007-07-23 15:40:41PeterWatson32007-04-23 15:05:04PeterWatson22007-04-23 14:59:32PeterWatson12007-04-23 14:52:05PeterWatsonOdds Ratios are useful in summarising the effect size or magnitude of a difference in a 2x 2 table. For example Group SoberDrunk
Complied1069
Refused5956
Odds Ratio = (106/9) / (59/56) = (106x56) / (9x59) = 11.18 The compliers were 11 times more likely to be sober than the refusers. You can obtain a confidence interval for the odds ratio using some simple calculations or by clicking on risk under statistics in the crosstabs procedure in SPSS.