https://communities.sas.com/t5/Statistical-Procedures/PS-Fine-Stratification-in-SAS/m-p/984119#M49300 <P>Hello, everyone</P> <P>&nbsp;</P> <P>Today I read a paper which used the&nbsp;PS Fine Stratification as their statistical analysis method. It was inspiring as the IPTW method can inflate the pseudo-cohort by outliers (by extreme low/high propensity scores). I know the robust variance estimator can handle the correlation between clone observations but the inflation itself can affect the accuracy of the confidence intervals.</P> <P>&nbsp;</P> <P>By the method of&nbsp;PS Fine Stratification, the IPTW-based inflation is not a problem as it will not use a pseudo-cohort. Therefore, I wonder if we can do&nbsp;PS Fine Stratification in SAS by existing syntaxes. Thank you.</P> Thu, 26 Feb 2026 08:20:22 GMT TomHsiung 2026-02-26T08:20:22Z https://communities.sas.com/t5/Statistical-Procedures/PS-Fine-Stratification-in-SAS/m-p/984119#M49300 <P>Hello, everyone</P> <P>&nbsp;</P> <P>Today I read a paper which used the&nbsp;PS Fine Stratification as their statistical analysis method. It was inspiring as the IPTW method can inflate the pseudo-cohort by outliers (by extreme low/high propensity scores). I know the robust variance estimator can handle the correlation between clone observations but the inflation itself can affect the accuracy of the confidence intervals.</P> <P>&nbsp;</P> <P>By the method of&nbsp;PS Fine Stratification, the IPTW-based inflation is not a problem as it will not use a pseudo-cohort. Therefore, I wonder if we can do&nbsp;PS Fine Stratification in SAS by existing syntaxes. Thank you.</P> Thu, 26 Feb 2026 08:20:22 GMT https://communities.sas.com/t5/Statistical-Procedures/PS-Fine-Stratification-in-SAS/m-p/984119#M49300 TomHsiung 2026-02-26T08:20:22Z https://communities.sas.com/t5/Statistical-Procedures/PS-Fine-Stratification-in-SAS/m-p/984169#M49303 <P>Two resource suggestions:</P> <UL> <LI>Ask the Expert webinar on the PSMATCH procedure:&nbsp;<A href="https://communities.sas.com/t5/Ask-the-Expert/I-Have-Results-From-PROC-PSMATCH-Now-What-Q-amp-A-Slides-and-On/ta-p/968294" target="_blank">I Have Results From PROC PSMATCH. Now What? Q&amp;A, Slides, and On-Demand... - SAS Support Communities</A></LI> <LI>Description of weights in the PSMATCH documentation:&nbsp;<A href="https://go.documentation.sas.com/doc/en/pgmsascdc/v_072/statug/statug_psmatch_details05.htm#statug.psmatch.psmattwgt" target="_blank">SAS Help Center: Propensity Score Weighting</A></LI> </UL> Thu, 26 Feb 2026 16:56:46 GMT https://communities.sas.com/t5/Statistical-Procedures/PS-Fine-Stratification-in-SAS/m-p/984169#M49303 JackieJ_SAS 2026-02-26T16:56:46Z