indt: Compute power for an Independent Samples t-test Takes means,...

Description Usage Arguments Value Examples

View source: R/indt.R

Description

Compute power for an Independent Samples t-test Takes means, sds, and sample sizes for each group. Alpha is .05 by default, alternative values may be entered by user

Usage

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indt(
  m1 = NULL,
  m2 = NULL,
  s1 = NULL,
  s2 = NULL,
  n1 = NULL,
  n2 = NULL,
  alpha = 0.05
)

Arguments

m1

Mean of first group

m2

Mean of second group

s1

Standard deviation of first group

s2

Standard deviation of second group

n1

Sample size for first group

n2

Sample size for second group

alpha

Type I error (default is .05)

Value

Power for Independent Samples t-test

Examples

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indt(m1=22,m2=20,s1=5,s2=5,n1=99,n2=99)
indt(m1=1.3, m2=0, s1=4,s2=1,n1=78,n2=234)

Example output

Equal Variance Power for n1 = 99 ,n2 = 99 with d = 0.4 = 0.8
Unequal Variance Power for n1 = 99, n2 = 99, with d = 0.4 = 0.8
Equal Variance Power for n1 = 78 ,n2 = 234 with d = 0.598 = 0.995
Unequal Variance Power for n1 = 78, n2 = 234, with d = 0.371 = 0.801

pwr2ppl documentation built on April 4, 2021, 9:06 a.m.