[R] meta-regression, MiMa function, and R-squared

[Christian Gold]

Dear Wolfgang Viechtbauer and list members:

I have discovered your "MiMa" function for fitting meta-analytic 
mixed-effects models through an earlier discussion on this list. I think 
it is extremely useful and fills an important gap. In particular, since 
it is programmed so transparently, it is easy to adapt it for one's own 
needs. (For example, I have found it easy to identify and adapt the few 
lines I had to change to make the function fit models without intercept 
- impossible with one of the commercial packages for meta-analysis).
I agree with Emmanuel Charpentier's suggestion that your function would 
be even more useful if it was more alike lm or glm (some time in the 
future perhaps). For now, one question: How do I calculate the correct 
R-squared for models fitted with MiMa?

Thanks

Christian Gold
University of Bergen
www.uib.no/people/cgo022