| r_to_d | R Documentation | 
This functions allows directly transforming r correlation values to Cohen's d values for consistent data presentation. Cohen's d is calcuated using the following formula.
d = \frac{2r}{\sqrt[]{(1-r^2)}}
r_to_d(
  r,
  round = 2
  )
| r | correlation value | 
| round | Rounding value for the effect size estimation | 
r_to_d(r = 0.2)
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