Meta Analysis: How do we really know?

Many of us, in either manuscripts or debates on forums, refer to meta-analysis as the gold standard of evidence. But how much do we really know? How many of us seek to close debates with a reference to meta-analysis and yet have no clue how they work.

I had the pleasure last Friday of attending a training course on meta analysis with the great Professor Herb Marsh from Oxford. In this course Professor Marsh referred to this article in review of general psychology. Likewise all Professors Marsh's training notes and workshopes are available here for free.

If you use meta analysis as evidence in your work or want to be a more savvy consumer this is the best place to start.

WARNING when the training moves to multi level meta analysis it can get a touch technical.