power.t: Statistical power for the t test for means

In rpsychi: Statistics for psychiatric research

Description

This is an internal function. power.t computes statistical power for the t test for means.

Usage

power.t(n1, n2, delta, sig.level = 0.05)

Arguments

n1	a numeric contains the sample size in group 1
n2	a numeric contains the sample size in group 2
delta	Cohen's d
sig.level	a numeric contains the significance level (default 0.05)

Value

Return a numeric containing the statistical power.

Author(s)

Yasuyuki Okumura
Department of Social Psychiatry,
National Institute of Mental Health,
National Center of Neurology and Psychiatry
[e-mail]

References

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

Examples

##Cohen (1988) ex.2.1
power.t(sig.level=.05, delta=0.5, n1=30, n2=30)

rpsychi documentation built on May 1, 2019, 10:10 p.m.