https://communities.sas.com/t5/Statistical-Procedures/GEE-procedure-with-3-levels/m-p/987579#M49415 <P>This usage note should address your question</P> <P><A href="https://support.sas.com/kb/24/200.html" target="_blank">24200 - When to use a nested effect in the SUBJECT= option of GENMOD's REPEATED statement</A></P> <P>&nbsp;</P> Fri, 08 May 2026 14:34:41 GMT SAS_Rob 2026-05-08T14:34:41Z https://communities.sas.com/t5/Statistical-Procedures/GEE-procedure-with-3-levels/m-p/987578#M49414 <P>Dear all,</P><P>I ran a logistic GEE model with repeated visits nested within individuals. However, I would also like to account for potential correlation among individuals from the same study site. Therefore, I would like to know whether this can be implemented using GEE. I have already fitted the model using a multilevel approach.</P><P>Thank you in advance.</P><P>Best regards,</P><P>Iuri</P> Fri, 08 May 2026 14:12:43 GMT https://communities.sas.com/t5/Statistical-Procedures/GEE-procedure-with-3-levels/m-p/987578#M49414 iuri_leite 2026-05-08T14:12:43Z https://communities.sas.com/t5/Statistical-Procedures/GEE-procedure-with-3-levels/m-p/987579#M49415 <P>This usage note should address your question</P> <P><A href="https://support.sas.com/kb/24/200.html" target="_blank">24200 - When to use a nested effect in the SUBJECT= option of GENMOD's REPEATED statement</A></P> <P>&nbsp;</P> Fri, 08 May 2026 14:34:41 GMT https://communities.sas.com/t5/Statistical-Procedures/GEE-procedure-with-3-levels/m-p/987579#M49415 SAS_Rob 2026-05-08T14:34:41Z