metaSEM (version 1.2.4)

Hunter83: Fourteen Studies of Correlation Matrices reported by Hunter (1983)

Description

This dataset includes fourteen studies of Correlation Matrices reported by Hunter (1983)

Usage

data(Hunter83)

Details

A list of data with the following structure:

data

A list of 14 studies of correlation matrices. The variables are Ability, Job knowledge, Work sample and Supervisor rating

n

A vector of sample sizes

Examples

# NOT RUN {
data(Hunter83)

#### Fixed-effects model
## First stage analysis
fixed1 <- tssem1(Hunter83$data, Hunter83$n, method="FEM",
                 model.name="TSSEM1 fixed effects model")
summary(fixed1)

#### Second stage analysis
## Model without direct effect from Ability to Supervisor
A1 <- create.mxMatrix(c(0,"0.1*A2J","0.1*A2W",0,0,0,"0.1*J2W","0.1*J2S",
                        0,0,0,"0.1*W2S",0,0,0,0),
                        type="Full", ncol=4, nrow=4, as.mxMatrix=FALSE)

## This step is not necessary but it is useful for inspecting the model.
dimnames(A1)[[1]] <- dimnames(A1)[[2]] <- c("Ability","Job","Work","Supervisor") 
A1

S1 <- create.mxMatrix(c(1,"0.1*Var_e_J", "0.1*Var_e_W", "0.1*Var_e_S"),
                      type="Diag", as.mxMatrix=FALSE)
dimnames(S1)[[1]] <- dimnames(S1)[[2]] <- c("Ability","Job","Work","Supervisor") 
S1

################################################################################
## Alternative model specification in lavaan model syntax
model <- "## Regression paths
          Job_knowledge ~ A2J*Ability
          Work_sample ~ A2W*Ability + J2W*Job_knowledge
          Supervisor ~ J2S*Job_knowledge + W2S*Work_sample

          ## Fix the variance of Ability at 1
          Ability ~~ 1*Ability

          ## Label the error variances of the dependent variables
          Job_knowledge ~~ VarE_J*Job_knowledge
          Work_sample ~~ VarE_W*Work_sample
          Supervisor ~~ VarE_S*Supervisor"

## Display the model
plot(model, layout="spring", sizeMan=10)

RAM <- lavaan2RAM(model, obs.variables=c("Ability","Job_knowledge",
                  "Work_sample","Supervisor"))
RAM

A1 <- RAM$A
S1 <- RAM$S

################################################################################
fixed2 <- tssem2(fixed1, Amatrix=A1, Smatrix=S1, intervals.type="LB",
                 diag.constraints=FALSE,
                 model.name="TSSEM2 fixed effects model")
summary(fixed2)

## Display the model with the parameter estimates
plot(fixed2, layout="spring")

## Coefficients
coef(fixed2)

## VCOV based on parametric bootstrap
vcov(fixed2)

#### Random-effects model with diagonal elements only
## First stage analysis
random1 <- tssem1(Hunter83$data, Hunter83$n, method="REM", RE.type="Diag", 
                  acov="individual", model.name="TSSEM1 random effects model")
summary(random1)

## Second stage analysis
## Model without direct effect from Ability to Supervisor

random2 <- tssem2(random1, Amatrix=A1, Smatrix=S1, intervals.type="LB",
                  diag.constraints=FALSE,
                  mx.algebras=
                  list( ind=mxAlgebra(A2J*J2S+A2J*J2W*W2S+A2W*W2S, name="ind") ),
                  model.name="TSSEM2 random effects model")
summary(random2)

## Display the model with the parameter estimates
plot(random2, layout="spring")

## Load the library
library("semPlot")
# }