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Converts R^2, the partial coefficient of determination, to robust effect size index (S) using the formula from Vandekar, Tao, & Blume (2020).
Rsq2S(Rsq)
Returns an estimate of R^2 based on the RESI
Numeric, R^2
The formula for the conversion is:
\(S = \sqrt((-R^2)/(R^2 - 1))\)
# consider a moderate effect size of R^2 = 0.1 Rsq2S(0.1) # this corresponds to a RESI of 0.333
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