Transform effect sizes.

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Description

Utility functions to transform various effect size measures into each other.

Usage

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r2z(r)
r2d(r)
z2r(z)
z2d(z)

Arguments

r

A correlation coefficient.

z

A z-value, ie a normalized effect size.

Details

Transform effect sizes into correlations, (Cohen's) d effect sizes, or z-distributed for performing meta regression.

Value

Return values are z, d or r values.

Author(s)

Ingmar Visser.

References

Tba

Examples

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## The function r2z is currently defined as
function(r) {
	return(0.5*(log(1+r)-log(1-r)))
  }