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Converts Cohen's f^2 to robust effect size index (S) using the formula from Vandekar, Tao, & Blume (2020).
fsq2S(fsq)
Returns an estimate the robust effect size index
Numeric, value of Cohen's f^2.
The formula for the conversion is:
\(S = \sqrt(f^2)\)
# consider a moderate effect size of f^2 = 0.3 fsq2S(0.3) # This corresponds to a RESI of 0.5477226
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