tfromd: Compute power for a t test using d statistic Takes d, sample...

In pwr2ppl: Power Analyses for Common Designs (Power to the People)

Compute power for a t test using d statistic Takes d, sample size range, type of test, and tails.

Description

Compute power for a t test using d statistic Takes d, sample size range, type of test, and tails.

Usage

tfromd(d, nlow, nhigh, alpha = 0.05, test = "I", tails = 2, by = 2)

Arguments

d	standardize mean difference (Cohen's d)
nlow	Starting total sample size
nhigh	Ending total sample size
alpha	Type I error (default is .05)
test	"I" for independent, "P" for paired
tails	one or two-tailed tests (default is 2)
by	Incremental increase in sample size from low to high

Value

Power for the t-test from d statistic

Examples

tfromd(d=.2,nlow=10,nhigh=200,by=10, test="P")
tfromd(d=.2,nlow=10,nhigh=200,by=10, test="I")

pwr2ppl documentation built on Sept. 6, 2022, 5:06 p.m.