pwr (version 1.2-0)

ES.h: Effect size calculation for proportions

Description

Compute effect size h for two proportions

Usage

ES.h(p1, p2)

Arguments

p1

First proportion

p2

Second proportion

Value

The corresponding effect size

Details

The effect size is 2*asin(sqrt(p1))-2*asin(sqrt(p2))

References

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

See Also

pwr.p.test, pwr.2p.test, pwr.2p2n.test, power.prop.test

Examples

## Exercise 6.5 p. 203 from Cohen 
h<-ES.h(0.5,0.4)
h
pwr.p.test(h=h,n=60,sig.level=0.05,alternative="two.sided")