SE and CI for ICC
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 [[alternative HTML version deleted]]
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