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jsalvatier comments on Literature-review on cognitive effects of modafinil (my bachelor thesis) - Less Wrong
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The standard solution seems to be 'multivariate meta-analysis'. I've done a little reading on the topic, but I've had trouble getting started with it - you need to know the correlations between the multiple outcome variables, this is typically unavailable (the data-sharing problem), and I think it only works anyway if there is at least a little bit of correlation between the multiple outcomes, while I would like to be able to collectively analyze outcomes from disjoint studies which is... less clear how to do.
Right that makes sense. People rarely report the covariance matrix of the data.
Much less provide IPD/individual-patient-data which is what one really wants. The lack of data is frustrating.
Indeed.