I am running a meta-analysis using metafor and getting what seem to be
conflicting results.
#analysis with species moderator
cropMeta.species<-rma(cropyi, cropvi, data=dataCropMeta,
mods=~dataCropMeta$species - 1, method="HE")
The output for the analysis using species as a moderator shows estimates for
the seven species in my data set, and makes sense.
#subset analysis with B oleraceae
cropMeta.species.b.oleracea<-rma(cropyi, cropvi, data=dataCropMeta,
subset=(species=="B. oleracea"), method="HE")
Then when I start to plot the results and use separate analyses for each
species in order to get the coef and variances for plotting the subgroups I get
different estimates. The estimates for most subgroups are almost identical in
both analyses, but one of them is 5.922 in the analysis with species as a
moderator, and 7.0139 in the subset analysis for only that species.
Why are the estimates different? If they should be different, then which
analysis is producing the correct estimates?
I'm happy to provide the data and R scripts if that would help.
many thanks,
Kathryn
---------------------------------
Dr. Kathryn Morris
Assistant Professor, Biology
Xavier University
3800 Victory Parkway
Cincinnati, OH
45207
Office: (513) 745-3554
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