[R] metafor- interpretation of moderators test for raw proportions

[cpanderson]

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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