As shown, I'm processing nhanes data with the Survey Logistic process, but what I don't understand is why the t-test is used instead of the chi-square test in the maximum likelihood ratio estimation in Surveylogistic. In the global test, the same is not used chi-square test but the f-test, in normal logistics regression, both the global test and the maximum likelihood ratio estimation use the chi-square test, I don't know why surveylogistic and logistic are different.. proc surveylogistic data=sasuser.begin nomcar; strata sdmvstra; cluster sdmvpsu; weight WTFOL2YR; domain category('1'); class serumgroup/param=ref ref=first; model diabete(desc) = serumgroup; run; proc surveylogistic data=sasuser.begin nomcar; strata sdmvstra; cluster sdmvpsu; weight WTFOL2YR; domain category('1'); class serumgroup/param=ref ref=first; model diabete(desc) = serumgroup; run; ... View more