At 17:03 03/08/2012, cpanderson wrote:
Wolfgang,
Thanks for your quick response. You are correct- indeed I had inadvertently
left out that i had set intercept = FALSE in rma.
Dear Christopher,
It does help if you paste in the exact code you used, see also below
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$Technique is already an object of class factor:
Pasting in the exact code would help here and maybe also giving the
output of traceback(). You might also consider pasting in the result
of summary(dat) unless it is really huge.
class(dat$Technique)
[1] "factor"
Thanks again.
Christopher
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Michael Dewey
i...@aghmed.fsnet.co.uk
http://www.aghmed.fsnet.co.uk/home.html
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