Re: [R] Comparing variance components

2016-02-16 Thread Bert Gunter
I'll save you the trouble. Yes, they're bigger. Or smaller. Certainly differ between experiments. So what? That is just the way things work. Google "weighting in meta-analysis" or similar for ways folks try to deal with this. Cheers, Bert On Tuesday, February 16, 2016, Wen Huang wrote: > H

Re: [R] Comparing variance components

2016-02-16 Thread Wen Huang
Hi Harold, Thank you for your input. I was not very clear. I wanted to compare the sigma2_A’s from the same model fitted to two different data sets. The same for sigma2_e’s. The motivation is when I did the same experiment at two different times, whether the variance due to A (sigma2_A) is bigg

Re: [R] Comparing variance components

2016-02-16 Thread Doran, Harold
(adding R mixed group). You actually do not want to do this test, and there is no "shrinkage" here on these variances. First, there are conditional variances and marginal variances in the mixed model. What you are have below as "A" is the marginal variances of the random effects and there is no