ES.h: Effect size calculation for proportions

In pwr: Basic Functions for Power Analysis

Description

Compute effect size h for two proportions

Usage

ES.h(p1, p2)

Arguments

p1	First proportion
p2	Second proportion

Details

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

Value

The corresponding effect size

Author(s)

Stephane CHAMPELY

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")

Example output

[1] 0.2013579

     proportion power calculation for binomial distribution (arcsine transformation) 

              h = 0.2013579
              n = 60
      sig.level = 0.05
          power = 0.3447014
    alternative = two.sided

pwr documentation built on March 17, 2020, 5:11 p.m.