Converts Cohen's d robust effect size index (S) using the formula from
Vandekar, Tao, & Blume (2020).
Usage
d2S(d, pi = 0.5)
Value
Returns an estimate the robust effect size index
Arguments
d
Numeric, value of Cohen's d.
pi
Numeric, the sampling proportions.
Details
The pi parameter comes from the fact that Cohen's d doesn't account
for unequal sample proportions in the population, but S does.
The default is set to a natural value 1/2, which corresponds to a case
control design, for example, where sampling proportions always are
controlled by the experimenter.
# Consider an experiment with equal sampling proportions and a medium effect size# corresponding to a Cohen's d of 0.5.# convert to RESI (S)d2S(d = 0.5)
# This corresponds to a RESI of 0.25.