I try to use proc logistic regression to estimate the probability difference between placebo and treatment group. It gives me odds ratio difference, how can I change to risk difference?
Also any difference between "risk difference" or "proportional difference" or "probability difference" between proc freq and proc logistic?
Thanks,
Better post it at Statistical Forum ,since it is about stat . @StatDave @Rick_SAS is there .
If your data is contingency table , like
placebo treatment
good 12 23
bad 2 3
you could try
PROC FREQ;
table group*good_bad / riskdiff ;
run;
"risk difference" is for 12/(23+12) V.S. 2/(2+3) or 23/(23+12) V.S. 3/(2+3)
"proportional difference"(a.k.a odds ratio) is for 12/23 V.S. 2/3
Better post it at Statistical Forum ,since it is about stat . @StatDave @Rick_SAS is there .
If your data is contingency table , like
placebo treatment
good 12 23
bad 2 3
you could try
PROC FREQ;
table group*good_bad / riskdiff ;
run;
"risk difference" is for 12/(23+12) V.S. 2/(2+3) or 23/(23+12) V.S. 3/(2+3)
"proportional difference"(a.k.a odds ratio) is for 12/23 V.S. 2/3
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