Look at the association between stroke and high blood pressure by sex. Do you see any signs of confounding or interaction/effect modification? Regardless of your conclusion, calculate the Cochran Mantel-Haenszel prevalence rate ratio and compare it to the crude prevalence rate ratio. Is confounding present?
When I am using SAS, I get an error of 50% of cells have expected counts less than 5 error message. How can I correct this? I'm trying to get the relative risks 1 and 2 and I am unable to get them. Can you help me with this? Please give me some specific code if you can because I am stumped.
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