https://communities.sas.com/t5/Statistical-Procedures/Fixed-Effect-Confidence-Intervals-in-PROC-MIXED/m-p/751078#M36514 <P>I would like to extract exact confidence intervals for the fixed effects from PROC MIXED. I have tried the CI returned by the SolutionF option, but they have coverage that is above the nominal level (in simulation studies with N=(12,40), they have 100% coverage). How can I extract more precise fixed effect CI from PROC MIXED?&nbsp;</P> Tue, 29 Jun 2021 22:00:40 GMT trumblei 2021-06-29T22:00:40Z https://communities.sas.com/t5/Statistical-Procedures/Fixed-Effect-Confidence-Intervals-in-PROC-MIXED/m-p/751078#M36514 <P>I would like to extract exact confidence intervals for the fixed effects from PROC MIXED. I have tried the CI returned by the SolutionF option, but they have coverage that is above the nominal level (in simulation studies with N=(12,40), they have 100% coverage). How can I extract more precise fixed effect CI from PROC MIXED?&nbsp;</P> Tue, 29 Jun 2021 22:00:40 GMT https://communities.sas.com/t5/Statistical-Procedures/Fixed-Effect-Confidence-Intervals-in-PROC-MIXED/m-p/751078#M36514 trumblei 2021-06-29T22:00:40Z https://communities.sas.com/t5/Statistical-Procedures/Fixed-Effect-Confidence-Intervals-in-PROC-MIXED/m-p/751088#M36517 <P>Code</P> <P>&nbsp;</P> <P>Data.</P> <P>&nbsp;</P> <P>If your N=(12,40) is sample sizes that might be an issue. Otherwise explain what that means.</P> Tue, 29 Jun 2021 22:42:20 GMT https://communities.sas.com/t5/Statistical-Procedures/Fixed-Effect-Confidence-Intervals-in-PROC-MIXED/m-p/751088#M36517 ballardw 2021-06-29T22:42:20Z