Bootstrapping for intraclass correlation coefficient (ICC) in Stata

2
votes

I want to bootstrap confidence intervals when running the intraclass correlation coefficient (ICC) in Stata 13

I tried 

bootstrap, reps(100) seed(1): icc ratings target judge, consistency

but this is not working.

Can anyone suggest the right code?

1
stata
this may help you - Metrics
Not much considering that icc is in stata 13. I just need to bootstrap the confidence intervals in view of problems with normal distr. - TheSquirrel
You are not specifying what saved results you want to bootstrap. Do look at the help for bootstrap and the manual entry for icc. - Nick Cox
I looked at help icc, it says bootstrap can be used it with it. - TheSquirrel
And can't get how to apply it. - TheSquirrel

1 Answers

2
votes

I don't have Stata 13; but here is my solution which I think this should work.

bootstrap ricc=r(icc_i), reps(100) seed(1): icc ratings target judge, consistency

where, r(icc_i) is the intraclass correlation for individual measurements; this is stored as scalar by Stata (see here) which you can get by typing return list after running the model.