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Transforms Zr to Hedge's g.
transformZrtoHg(Zr, Nc, Nt)
value of Hedges' g
the normal variate
the number of observations (participants) in the first (control) group
the number of observations (participants) in the second (treatment) group
Barbara Kitchenham and Lech Madeyski
transformZrtoHg(0.5, 20, 20) # [1] 1.042191
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