[R-sig-ME] SE and CI for ICC

[Mark Lai]

Hi Masood,

I think you can do a parametric bootstrap for the ICC with the bootMer 
method in lme4. You will need to define the function for obtaining the 
ICC, and then from the bootstrap resamples you can construct your 
confidence intervals (e.g, by taking the 2.5 and the 97.5 percentiles).

Hope this helps,

Mark

On 09/12/2014 11:20 AM, Mohd Masood wrote:
> I am using random intercept logistic model (in lme4) to calculated
> Intraclass correlation coefficient (ICC). lme4 only provides point
> estimates and standard deviation (not standard errors) of variance
> estimates.These
> point estimates can be used to calculated point estimates for ICC. The
> problem is how can I calculate standard error and confidence interval for
> ICC. I couldn't find any literature showing formula to calculate confidence
> interval around ICC.  Or is it not possible to calculate SE and CI for ICC
> due to skewed sampling distribution (Please see PMCID: PMC3426610).
>
> Thanks
> Masood
>
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