Check the correctness of the RAM formulation
It provides simple checks on the correctness of the RAM formulation.
checkRAM(Amatrix, Smatrix, cor.analysis=TRUE)
Amatrix |
An asymmetric matrix in the RAM specification with
|
Smatrix |
A symmetric matrix in the RAM specification with
|
cor.analysis |
Logical. Analysis of correlation or covariance
structure. There are additional checks for cor.analysis= |
It returns silently if no error has been detected; otherwise, it returns a warning message.
Mike W.-L. Cheung <mikewlcheung@nus.edu.sg>
## Not run:
## Digman97 example
model1 <- "## Factor loadings
Alpha=~A+C+ES
Beta=~E+I
## Factor correlation
Alpha~~Beta"
RAM1 <- lavaan2RAM(model1, obs.variables=c("A","C","ES","E","I"),
A.notation="on", S.notation="with")
RAM1
## The model is okay.
checkRAM(Amatrix=RAM1$A, Smatrix=RAM1$S)
## Hunter83 example
model2 <- "## 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"
RAM2 <- lavaan2RAM(model2, obs.variables=c("Ability","Job_knowledge",
"Work_sample","Supervisor"))
## The model is okay.
checkRAM(Amatrix=RAM2$A, Smatrix=RAM2$S)
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