Convert a correlation to Cohen's d

Uses the common two-group approximation d = 2r / sqrt(1 - r^2).

Usage

cor_to_d(r)

Arguments

r

Correlation coefficient.

Value

Cohen's d.

References

Schmidt, F. L., Hunter, J. E., & Pearlman, K. (1982). Assessing the economic impact of personnel programs on workforce productivity. Personnel Psychology, 35, 333-347.

Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). Erlbaum.

Examples

# Literature: Cohen (1988); Schmidt, Hunter, and Pearlman (1982).
cor_to_d(.30)
#> [1] 0.6289709