topic investigation for significant covariate in Statistical Procedures https://communities.sas.com/t5/Statistical-Procedures/investigation-for-significant-covariate/m-p/209752#M11347 <HTML><HEAD></HEAD><BODY><P>Hi all,</P><P></P><P>i have one issue right now, please help me to move forward.</P><P></P><P>i used logistic model with forward selection method to find out significat covariates. in this case i got <STRONG>weight a significant variable</STRONG> from logistic procedure. then i got a comment that "why weight significant variable. please cross check and let me know the reason"? so in this case how can i cross check why this variable (Weight) significant?</P><P></P><P>please suggest me how to resolve this problem?</P><P></P><P>Many Thanks,</P><P>Hima</P></BODY></HTML> Thu, 23 Jul 2015 06:25:49 GMT HimaAalamuri 2015-07-23T06:25:49Z investigation for significant covariate https://communities.sas.com/t5/Statistical-Procedures/investigation-for-significant-covariate/m-p/209752#M11347 <HTML><HEAD></HEAD><BODY><P>Hi all,</P><P></P><P>i have one issue right now, please help me to move forward.</P><P></P><P>i used logistic model with forward selection method to find out significat covariates. in this case i got <STRONG>weight a significant variable</STRONG> from logistic procedure. then i got a comment that "why weight significant variable. please cross check and let me know the reason"? so in this case how can i cross check why this variable (Weight) significant?</P><P></P><P>please suggest me how to resolve this problem?</P><P></P><P>Many Thanks,</P><P>Hima</P></BODY></HTML> Thu, 23 Jul 2015 06:25:49 GMT https://communities.sas.com/t5/Statistical-Procedures/investigation-for-significant-covariate/m-p/209752#M11347 HimaAalamuri 2015-07-23T06:25:49Z Re: investigation for significant covariate https://communities.sas.com/t5/Statistical-Procedures/investigation-for-significant-covariate/m-p/209753#M11348 <HTML><HEAD></HEAD><BODY><P>Have you looked at data plots to see how the response variable trends with respect to weight?&nbsp; Also, since you used an automated selection method, there is a very strong possibility that it got included because there are moderating or mediating variables previously included.&nbsp; Search this site for links to Flom and Cassell's SUGI article pointing out problems with stepwise variable selection methods.</P><P></P><P>In the end, "why" questions come down to your subject specific knowledge about the field and your data.&nbsp; Statistical analysis can help illuminate this, but it cannot answer it.</P><P></P><P>Steve Denham</P></BODY></HTML> Thu, 23 Jul 2015 12:12:55 GMT https://communities.sas.com/t5/Statistical-Procedures/investigation-for-significant-covariate/m-p/209753#M11348 SteveDenham 2015-07-23T12:12:55Z