Hi all   I am comparing proportion of people who attend a clinic between two different time periods.   the two time periods are different in length – one is 3-months; the other is 9 months.   I would like to ask how do I tell SAS the time (or how does SAS understand what my time is) - in my code I have entered 3 for 3 months and 9 for 9 months - is this correct - would appreciate any advice   thanks   data Non_urg(keep=time case log_t); infile datalines; input time case pop; log_t=log(time); output Non_urg; datalines; 9 144 1574 3 76 916 ; proc genmod data=Non_urg; model case=time/ dist=poisson link=log offset=log_t; run; ... View more

Hi   can i get confidence intervals for each cell in a "r x c table" (based on row percent)   I have used the riskfdiff option in a 2x2 table ; but obviously this does not work on 3x2 table   data 2x2; input Shop $ Low Total; Outcome="2.High"; Count=Total-Low ; output; Outcome="1.Low"; Count=Low ; output; datalines; Shop1 7000 15275 Shop2 2500 7500 ; proc print data=2x2; var Shop Outcome Count; run; proc freq data=2x2 order=formatted; weight Count; table Shop * Outcome / nopercent nocol chisq riskdiff; run;     /******************/   data 3x2; input Shop $ Low Total; Outcome="2.High"; Count=Total-Low ; output; Outcome="1.Low"; Count=Low ; output;   datalines; Shop1 7000 15275 Shop2 2500 7500 Shop3 1850 5250 ; proc print data=3x2; var Shop Outcome Count; run; proc freq data=3x2order=formatted; weight Count; table Shop * Outcome / nopercent nocol chisq ; run;   I've worked it out using an online calculator but can;t replicate in SAS - i would really appreciate any guidance    many thanks L     ... View more