Thank you for the suggestions! I tried both. Using GLIMMIX: Over the entire period, the Type III Tests of Fixed Effects show Year is significant, F=6.61, p<.0001. When I subset the data to the two years that are close in percentage of "Yes" then the results non-significant. Using chi-square test: Over the entire period, Chi-square=62.48, p<.0001. When I subset the data to the two years that are close in percentage of "Yes" then the results non-significant. Since we're talking about simple models, is SURVEYLOGISTIC appropriate? I ask because it will allow me to use strata and cluster information in the data. Using SURVEYLOGISTIC: The Analysis of Maximum Likelihood Estimates shows Year is non-significant, t=-1.14, p=.97 Thank you again!
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