http://en.wikipedia.org/wiki/Fisher%27s_method#Relation_to_Stouffer.27s_Z-score_method
A closely related approach to Fisher's method is based on Z-scores rather than p-values.
One advantage of the Z-score approach is that it is straightforward to introduce weights.
Stouffer, S.A.; E.A. Suchman, L.C. DeVinney, S.A. Star, R.M. Jr. Williams (1949). The American Soldier, Vol.1: Adjustment during Army Life. Princeton University Press, Princeton,.
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