https://communities.sas.com/t5/Statistical-Procedures/Stratification-for-the-purpose-of-interaction/m-p/672515#M32176 <P><a href="https://communities.sas.com/t5/user/viewprofilepage/user-id/335452">@microdire27</a>&nbsp; - This appears to be a duplication of your question here (<A href="https://communities.sas.com/t5/Statistical-Procedures/Stratification-Using-SAS/m-p/670750#M32042" target="_self">https://communities.sas.com/t5/Statistical-Procedures/Stratification-Using-SAS/m-p/670750#M32042</A>&nbsp;).&nbsp; See my response at that link.</P> <P>&nbsp;</P> <P>SteveDenham</P> Mon, 27 Jul 2020 12:52:23 GMT SteveDenham 2020-07-27T12:52:23Z https://communities.sas.com/t5/Statistical-Procedures/Stratification-for-the-purpose-of-interaction/m-p/670742#M32160 <P>Hello all,</P><P>Is it possible not to have a reference group during stratification in SAS?</P><P>As shown in the table attached to this question, my professor asked for stratification of the ADHD severity level. I am not sure of how to achieve this with SAS since there must be a comparison group (ref group) and I have only two levels. Please help</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="microdire27_0-1595268568537.png" style="width: 400px;"><img src="https://communities.sas.com/t5/image/serverpage/image-id/47357iBB30B7AC38F62B1E/image-size/medium?v=v2&amp;px=400" role="button" title="microdire27_0-1595268568537.png" alt="microdire27_0-1595268568537.png" /></span></P><DIV class="mceNonEditable lia-copypaste-placeholder">&nbsp;</DIV><P>&nbsp;</P><DIV class="mceNonEditable lia-copypaste-placeholder">&nbsp;</DIV><DIV class="mceNonEditable lia-copypaste-placeholder">&nbsp;</DIV><DIV class="mceNonEditable lia-copypaste-placeholder">&nbsp;</DIV><DIV class="mceNonEditable lia-copypaste-placeholder">&nbsp;</DIV><DIV class="mceNonEditable lia-copypaste-placeholder">&nbsp;</DIV><DIV class="mceNonEditable lia-copypaste-placeholder">&nbsp;</DIV><P>&nbsp;</P> Mon, 20 Jul 2020 18:10:53 GMT https://communities.sas.com/t5/Statistical-Procedures/Stratification-for-the-purpose-of-interaction/m-p/670742#M32160 microdire27 2020-07-20T18:10:53Z https://communities.sas.com/t5/Statistical-Procedures/Stratification-for-the-purpose-of-interaction/m-p/672424#M32161 <P>Moved to <EM>stats</EM> community where you are more likely to get a reply.</P> Sun, 26 Jul 2020 23:58:47 GMT https://communities.sas.com/t5/Statistical-Procedures/Stratification-for-the-purpose-of-interaction/m-p/672424#M32161 ChrisNZ 2020-07-26T23:58:47Z https://communities.sas.com/t5/Statistical-Procedures/Stratification-for-the-purpose-of-interaction/m-p/672515#M32176 <P><a href="https://communities.sas.com/t5/user/viewprofilepage/user-id/335452">@microdire27</a>&nbsp; - This appears to be a duplication of your question here (<A href="https://communities.sas.com/t5/Statistical-Procedures/Stratification-Using-SAS/m-p/670750#M32042" target="_self">https://communities.sas.com/t5/Statistical-Procedures/Stratification-Using-SAS/m-p/670750#M32042</A>&nbsp;).&nbsp; See my response at that link.</P> <P>&nbsp;</P> <P>SteveDenham</P> Mon, 27 Jul 2020 12:52:23 GMT https://communities.sas.com/t5/Statistical-Procedures/Stratification-for-the-purpose-of-interaction/m-p/672515#M32176 SteveDenham 2020-07-27T12:52:23Z