rpsychi (version 0.3)

power.f: Statistical power for F tests on means in the analysis of variance

Description

This is an internal function. power.f computes statistical power for F tests on means in the analysis of variance.

Usage

power.f(u, n, delta, sig.level = 0.05)

Arguments

u

degree of freedom of the numerator of the F ratio

n

sample size

delta

Cohen's $f$

sig.level

a numeric contains the significance level (default 0.05)

Value

• Return a numeric containing the statistical power.

encoding

UTF-8

References

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

Examples

##Cohen (1988) ex.8.1
power.f(u = 3, n = 20, delta=.28, sig.level=.05)
power.f(u = 3, n = 20, delta=.28, sig.level=.10)


##Cohen (1988) ex 8.2
power.f(u = 2, n = 200, delta=.23, sig.level=.01)
power.f(u = 2, n = 200, delta=.33, sig.level=.01)