https://communities.sas.com/t5/SAS-Procedures/Bootstrap-95CI-for-IPTW-of-COx-model/m-p/823347#M81938 <P>Were you able to resolve this problem? I'm currently facing a similar issue</P><P>&nbsp;</P> Thu, 14 Jul 2022 15:53:07 GMT denat 2022-07-14T15:53:07Z https://communities.sas.com/t5/SAS-Procedures/Bootstrap-95CI-for-IPTW-of-COx-model/m-p/641606#M78343 <P>Hello,</P><P>&nbsp;</P><P>I am using IPTW for Cox (survival model - proc phreg) model. However, it's said that the confident interval generated by this procedure will create bias even using a robust estimate. One stimulation suggested using bootstrap to obtain 95%CI.</P><P>&nbsp;</P><P>I have never done&nbsp;bootstrap before and I wonder how to integrate&nbsp; the inverse weight into the bootstrap. Could anyone please help me with this? Could I use inverse weight as survey weight to calculate bootstrap? My guess is these 2 weights are different, one by design and another is pseudo weight to create population balance.</P><P>&nbsp;</P><P>Many thanks!</P> Tue, 21 Apr 2020 13:38:46 GMT https://communities.sas.com/t5/SAS-Procedures/Bootstrap-95CI-for-IPTW-of-COx-model/m-p/641606#M78343 Dunne 2020-04-21T13:38:46Z https://communities.sas.com/t5/SAS-Procedures/Bootstrap-95CI-for-IPTW-of-COx-model/m-p/823347#M81938 <P>Were you able to resolve this problem? I'm currently facing a similar issue</P><P>&nbsp;</P> Thu, 14 Jul 2022 15:53:07 GMT https://communities.sas.com/t5/SAS-Procedures/Bootstrap-95CI-for-IPTW-of-COx-model/m-p/823347#M81938 denat 2022-07-14T15:53:07Z