pwr2ppl (version 0.5.0)

anova2x2: Compute power for a Two by Two Between Subjects ANOVA. Takes means, sds, and sample sizes for each group. Alpha is .05 by default, alternative values may be entered by user

Description

Compute power for a Two by Two Between Subjects ANOVA. Takes means, sds, and sample sizes for each group. Alpha is .05 by default, alternative values may be entered by user

Usage

anova2x2(
  m1.1 = NULL,
  m1.2 = NULL,
  m2.1 = NULL,
  m2.2 = NULL,
  s1.1 = NULL,
  s1.2 = NULL,
  s2.1 = NULL,
  s2.2 = NULL,
  n1.1 = NULL,
  n1.2 = NULL,
  n2.1 = NULL,
  n2.2 = NULL,
  alpha = 0.05,
  all = "OFF"
)

Value

Power for the Two Factor ANOVA

Arguments

m1.1

Cell mean for First level of Factor A, First level of Factor B

m1.2

Cell mean for First level of Factor A, Second level of Factor B

m2.1

Cell mean for Second level of Factor A, First level of Factor B

m2.2

Cell mean for Second level of Factor A, Second level of Factor B

s1.1

Cell standard deviation for First level of Factor A, First level of Factor B

s1.2

Cell standard deviation for First level of Factor A, Second level of Factor B

s2.1

Cell standard deviation for Second level of Factor A, First level of Factor B

s2.2

Cell standard deviation for Second level of Factor A, Second level of Factor B

n1.1

Cell sample size for First level of Factor A, First level of Factor B

n1.2

Cell sample size for First level of Factor A, Second level of Factor B

n2.1

Cell sample size for Second level of Factor A, First level of Factor B

n2.2

Cell sample size for Second level of Factor A, Second level of Factor B

alpha

Type I error (default is .05)

all

Power(ALL) - Power for detecting all predictors in the model at once (default is "OFF")

Examples

anova2x2(m1.1=0.85, m1.2=0.85, m2.1=0.00, m2.2=0.60,
s1.1=1.7, s1.2=1.7, s2.1=1.7, s2.2=1.7,
n1.1=100, n1.2=100, n2.1=100, n2.2=100, alpha=.05)
anova2x2(m1.1=0.85, m1.2=0.85, m2.1=0.00, m2.2=0.60,
s1.1=1.7, s1.2=1.7, s2.1=1.7, s2.2=1.7,
n1.1=100, n1.2=100, n2.1=100, n2.2=100,
alpha=.05, all="ON")