https://communities.sas.com/t5/Statistical-Procedures/all-NA-estimate-for-survival-quartile-estimate/m-p/882984#M43679 <P>You need to look at your survival curve/survival estimates.&nbsp; &nbsp;If the curve doesn't drop below S(t) = 0.50 then the median does not exist.&nbsp; &nbsp; I suspect the same for all of your other quartiles as well.&nbsp; &nbsp;They may not exist for your data.&nbsp;</P> Thu, 29 Jun 2023 18:08:01 GMT OsoGris 2023-06-29T18:08:01Z https://communities.sas.com/t5/Statistical-Procedures/all-NA-estimate-for-survival-quartile-estimate/m-p/882870#M43677 <P>This is my code, but I just realized the result I have are all missing values.&nbsp; &nbsp;I wonder how can I get the median survival time?</P><P>&nbsp;</P><P>proc lifetest data=survival method=km;<BR />time survival_time * event(0);<BR />strata race;<BR />run;</P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture.PNG" style="width: 327px;"><img src="https://communities.sas.com/t5/image/serverpage/image-id/85445i4C3E38C3B2067A06/image-dimensions/327x280?v=v2" width="327" height="280" role="button" title="Capture.PNG" alt="Capture.PNG" /></span></P> Wed, 28 Jun 2023 21:46:23 GMT https://communities.sas.com/t5/Statistical-Procedures/all-NA-estimate-for-survival-quartile-estimate/m-p/882870#M43677 L777 2023-06-28T21:46:23Z https://communities.sas.com/t5/Statistical-Procedures/all-NA-estimate-for-survival-quartile-estimate/m-p/882984#M43679 <P>You need to look at your survival curve/survival estimates.&nbsp; &nbsp;If the curve doesn't drop below S(t) = 0.50 then the median does not exist.&nbsp; &nbsp; I suspect the same for all of your other quartiles as well.&nbsp; &nbsp;They may not exist for your data.&nbsp;</P> Thu, 29 Jun 2023 18:08:01 GMT https://communities.sas.com/t5/Statistical-Procedures/all-NA-estimate-for-survival-quartile-estimate/m-p/882984#M43679 OsoGris 2023-06-29T18:08:01Z