Wolfgang,
Thanks for your quick response. You are correct- indeed I had inadvertently
left out that i had set intercept = FALSE in rma.
Following your suggestions, I get the following results:
Test of Moderators (coefficient(s) 2,3):
QM(df = 2) = 0.2207, p-val = 0.8955
Model Results:
estimate se zval pval ci.lb ci.ub
intrcpt 0.6498 0.0492 13.2160 <.0001 0.5534 0.7462 ***
Complex 0.0457 0.1007 0.4538 0.6500 -0.1517 0.2430
Dome 0.0244 0.1135 0.2148 0.8299 -0.1980 0.2468
This may be an even dumber question than my first one, but if you have time
I'd appreciate knowing how this works. Originally I had tried the syntax
mods = ~ Technique. I ended up getting the following error message:
Error in qr.solve(wX, diag(k)) : singular matrix 'a' in solve
if I supply the argument that mods =~ factor(Technique), I don't get the
singular matrix 'a' message. But I don't understand why that should make a
difference, because dat$Technique is already an object of class factor:
class(dat$Technique)
[1] "factor"
Thanks again.
Christopher
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