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st: Meta-analysis of SMRs
I am conducting meta-analyses of SMRs using the -meta- command which works fine until you have observed values of zero. I am using the formulae
log(SMR) = log(observed/expected)
se(log(SMR)) = 1/sqrt(observed)
and both are undefined when the observed value=0. Does anyone have any suggestions for dealing with this situation other than
omitting studies with zeroes or combining them with other studies? Are there other formulae to calculate se(log(SMR)) which is not based solely on the observed value?
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