Hi I wonder why running proc logistic without weight statement and proc surveylogistic without weight statement will have different SE/variance as both weight would be treated as default 1? E.G. code A vs code B below.   A. Proc logistic data=xyz;  /*ignore sample survey weight*/     model Y=x1-x8/link=glogit;   run;   B. Proc surveylogistic data=xyz; /*ignore sample survey weight*/     model Y=x1-x8/link=glogit;    run;   Also, what is the harm/negative consequences that I only apply proc logistic without weight to build a model against sample survey with known designed weight(variable) instead of apply proc surveylogistic together with weight statement, which is SAS document/procedure recommended way. E.G. code A vs code C below.   A. Proc logistic data=xyz;  /*ignore sample survey weight*/     model Y=x1-x8/link=glogit;   run;   C. Proc surveylogistic data=xyz;     model Y=x1-x8/link=glogit;     weight w; run;     Thank you TWU ... View more