Hello all, I'm working with national survey data that ask people if they have participated in a cancer screening program, something like - "Have You Ever Taken the Cancer Test?" - Yes/No. I have two different years of the survey, 2010 & 2015 and have calculated the proportion of people who answered Yes for all the Provinces, for both survey year, but I'd also like to test if there's significant difference in the proportion of people who have screened in 2010 vs 2015 Here's the data and what I have tried: data screen_rates; input Year $ Province $ Screen $ count; datalines; cchs2010 A Yes 54 cchs2010 A No 46 cchs2010 B Yes 53 cchs2010 B No 47 cchs2010 C Yes 55 cchs2010 C No 45 cchs2010 D Yes 54 cchs2010 D No 46 cchs2017 A Yes 48 cchs2017 A No 52 cchs2017 B Yes 43 cchs2017 B No 57 cchs2017 C Yes 51 cchs2017 C No 49 cchs2017 D Yes 49 cchs2017 D No 51 ; run; proc freq data= screen_rates; tables Year*Province*Screen /chisq riskdiff; weight Count; run; But I saw this message in the log: RISKDIFF statistics are computed only for 2x2 tables. I think there should be a way to test the proportions for each province in 2010 vs 2015 for significance, but nothing has worked for me thus far. I appreciate suggestions and ideas. Thank you!
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