[R-sig-ME] correlation of two tests treating items of both tests asrandom effects?

[David Duffy]

On Fri, 6 Nov 2015, Jonathan Baron wrote:

> I thought I had a solution to this problem, but I don't. The problem
> is very simple to state. It is to find whether one test correlates
> with another, when each test has several items sampled from a larger
> population of potential items.

Isn't this just the usual question about how to run a multivariate mixed 
model in lme4?  So you stack both tests with an appropriate indicator 
variable, and read off the correlations from the RE variances/covariances?

| David Duffy (MBBS PhD)
| email: David.Duffy at qimrberghofer.edu.au  ph: INT+61+7+3362-0217 fax: -0101
| Genetic Epidemiology, QIMR Berghofer Institute of Medical Research
| 300 Herston Rd, Brisbane, Queensland 4006, Australia  GPG 4D0B994A