topic Re: ICC in multi-level beta regression in Statistical Procedures

ICC in multi-level beta regression

user201 — Wed, 12 Jan 2022 02:54:03 GMT

Could anyone help me figure out how to calculate intraclass correlation coefficient for a two-level beta regression model? I am using proc glimmix and dist=beta link=logit options. The output doesn't produce variance of level-1 residuals, which is typically used to calculate ICC. Is there a way to calculate that variance? Could the following formula be used in this case (found it in this document)?

Thank you!

Re: ICC in multi-level beta regression

Ksharp — Wed, 12 Jan 2022 12:49:46 GMT

Search it at

https://support.sas.com/kb/30/333.html

Re: ICC in multi-level beta regression

SteveDenham — Tue, 18 Jan 2022 14:54:49 GMT

Take a look at the example https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.4/statug/statug_glimmix_examples24.htm

The variance components needed to calculate an ICC appear in the Covariance Parameter Estimates table in the output, which has the ODS table name CovParms.

SteveDenham