med: Compute Power for Mediated (Indirect) Effects Requires...

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

Compute Power for Mediated (Indirect) Effects Requires correlations between all variables as sample size. This approach calculates power for the Sobel test. The medjs function calculates power based on joint significance (recommended)

Description

Compute Power for Mediated (Indirect) Effects Requires correlations between all variables as sample size. This approach calculates power for the Sobel test. The medjs function calculates power based on joint significance (recommended)

Usage

med(
  rxm1,
  rxm2 = 0,
  rxm3 = 0,
  rxm4 = 0,
  rxy,
  rym1,
  rym2 = 0,
  rym3 = 0,
  rym4 = 0,
  rm1m2 = 0,
  rm1m3 = 0,
  rm1m4 = 0,
  rm2m3 = 0,
  rm2m4 = 0,
  rm3m4 = 0,
  alpha = 0.05,
  mvars,
  n
)

Arguments

rxm1	Correlation between predictor (x) and first mediator (m1)
rxm2	Correlation between predictor (x) and second mediator (m2)
rxm3	Correlation between predictor (x) and third mediator (m3)
rxm4	Correlation between predictor (x) and fourth mediator (m4)
rxy	Correlation between DV (y) and predictor (x)
rym1	Correlation between DV (y) and first mediator (m1)
rym2	Correlation between DV (y) and second mediator (m2)
rym3	Correlation DV (y) and third mediator (m3)
rym4	Correlation DV (y) and fourth mediator (m4)
rm1m2	Correlation first mediator (m1) and second mediator (m2)
rm1m3	Correlation first mediator (m1) and third mediator (m3)
rm1m4	Correlation first mediator (m1) and fourth mediator (m4)
rm2m3	Correlation second mediator (m2) and third mediator (m3)
rm2m4	Correlation second mediator (m2) and fourth mediator (m4)
rm3m4	Correlation third mediator (m3) and fourth mediator (m4)
alpha	Type I error (default is .05)
mvars	Number of Mediators
n	Sample size

Value

Power for Mediated (Indirect) Effects

Examples

med(rxm1=.25, rxy=-.35, rym1=-.5,mvars=1, n=150)
med(rxm1=.3, rxm2=.3, rxm3=.25, rxy=-.35, rym1=-.5,rym2=-.5, rym3 = -.5,
rm1m2=.7, rm1m3=.4,rm2m3=.4, mvars=3, n=150)

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