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Hi;You can get a probability from the odds.
Tks for your reply. I input a wrong number that Number in 1st group: a=26 not 25 if 25 ,2 .777 is right.like formula Odds ratio = (a/c) / (b/d) ,what is the formula for probability？
Hi;Are you doing something like this?http://www.youtube.com/watch?v=ITi0SxmQTO8I am getting an OR = 2.7777777777Also I think you mean P rather than p.Z scores are measures of standard deviation. P is a probability.
I input a,b,c,d use odds ratio calculatorCases with positive outcomeNumber in 1st group: a=25Number in 2nd group: b=15Cases with negative outcomeNumber in 1st group: c=18Number in 2nd outcome: d=30and calculateResultsOdds ratio 2.888995 % CI 1.2184 to 6.8497z statistic 2.408P = 0.0160I know odds ratio is Odds ratio = (a/c) / (b/d)my question is what z statistic and p mean ?
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