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The functions transforms a vector of Hedges g values to their normal approximation of point bi-serial values.
transformHgtoZr(g, Nc, Nt)
value of normal approximation of point biserial r
value of Hedges' g
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
transformHgtoZr(0.5, 20, 20) # [1] 0.2474665
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