topic GENMOD confidence interval in SAS Procedures https://communities.sas.com/t5/SAS-Procedures/GENMOD-confidence-interval/m-p/22414#M4919 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>proc GENMOD (dist=normal &amp; link=identity) gives different estimate for the confidence interval of the individual predicted values.</P><P>Someone&nbsp; knows why?</P><P></P><P></P><P></P><P></P><P>Thanks in advance</P><P>Barbara P.</P><P></P><P></P><P></P></BODY></HTML> Mon, 03 Oct 2011 13:01:45 GMT COMPAREMISSING 2011-10-03T13:01:45Z GENMOD confidence interval https://communities.sas.com/t5/SAS-Procedures/GENMOD-confidence-interval/m-p/22414#M4919 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P>proc GENMOD (dist=normal &amp; link=identity) gives different estimate for the confidence interval of the individual predicted values.</P><P>Someone&nbsp; knows why?</P><P></P><P></P><P></P><P></P><P>Thanks in advance</P><P>Barbara P.</P><P></P><P></P><P></P></BODY></HTML> Mon, 03 Oct 2011 13:01:45 GMT https://communities.sas.com/t5/SAS-Procedures/GENMOD-confidence-interval/m-p/22414#M4919 COMPAREMISSING 2011-10-03T13:01:45Z GENMOD confidence interval https://communities.sas.com/t5/SAS-Procedures/GENMOD-confidence-interval/m-p/22415#M4920 <HTML><HEAD></HEAD><BODY><P>Maybe I'm misunderstanding your question, but GENMOD does not give prediction intervals for individual responses.</P><P></P><P>There are two confidence intervals that regression routines return. The familiar one is the confidence interval for the mean predicted value. (Most/All SAS regression procedures return this.)&nbsp; The other is prediction limits for an individual response.&nbsp; REG and GLM return this, but GENMOD does not.</P><P></P><P>For details, see the formulas for LowerM versus LowerI in the regression chapter of the SAS/STAT doc: <A href="http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_introreg_sect010.htm">http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_introreg_sect010.htm</A></P></BODY></HTML> Mon, 03 Oct 2011 15:42:56 GMT https://communities.sas.com/t5/SAS-Procedures/GENMOD-confidence-interval/m-p/22415#M4920 Rick_SAS 2011-10-03T15:42:56Z