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Hello,
I am attempting to use the postestimation command "estat icc" after using xtmixed for a mixed model. However, each of my attempts ends with this error:
. estat icc
invalid subcommand icc
r(321);
-------------------------------------------------------------------------------
search for r(321) (manual: [R] search)
-------------------------------------------------------------------------------
Keywords: r(321)
Search: (1) Official help files, FAQs, Examples, SJs, and STBs
Search of official help files, FAQs, Examples, SJs, and STBs
[P] error . . . . . . . . . . . . . . . . . . . . . . . . Return code 321
requested action not valid after most recent estimation command;
This message can be produced by predict or test and indicates
that the requested action cannot be performed.
(end of search)
I am confused by this error since I found the estat icc command in documentation specific to xtmixed postestimations published by Stata. Specifically, the documentation says:
estat icc displays the intraclass correlation for pairs of responses at
each nested level of the model. Intraclass correlations are available for
random-intercept models or for random-coefficient models conditional on
random-effects covariates being equal to zero. They are not available
for crossed-effects models or with residual error structures other than
independent structures.
Is there some reason why I would not be able to use estat icc? I am using Stata 12.
Thank you for your help.
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