[R] Another SEM question

Stein, Luba (AIM SE) LUBA.STEIN at ALLIANZ.COM
Tue Jul 21 08:11:44 CEST 2009


Thank you for your advice. So I am sending the whole code

data.dir <- file.path(home.dir, "Data")
file     <- file.path(data.dir, "data4.csv")

SEM <- read.csv(file)
print(SEM)

library(sem)
SEM1 <- as.matrix(cbind(SEM$R1, SEM$I1, SEM$M1))
print(SEM1)
mod.cov <- cov(SEM1)
print(mod.cov)

I <- SEM$I1
M <- SEM$M1
R <- SEM$R1

model <- specify.model()
Z -> M
Z -> I
Z -> R
M <-> M
I <-> I
R <-> R
Z <-> Z

sem.mod <- sem(model, mod.cov, N=109)
summary(sem.mod)



All vectors have a length of 109. 


Thank you for your help once again.

Best wishes,
Luba



-----Urspr?ngliche Nachricht-----
Von: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] Im Auftrag von Jarrett Byrnes
Gesendet: Montag, 20. Juli 2009 18:25
An: Stein, Luba (AIM SE)
Cc: r-help at r-project.org
Betreff: Re: [R] Another SEM question

Luba,

If you could provide the code you ran, perhaps the listserv can be of  
help.

On Jul 20, 2009, at 7:55 AM, Stein, Luba (AIM SE) wrote:

> Hello,
>
> I use the function sem the following way
> sem.mod <- sem(model, mod.cov, N=109) where the variables are  
> modelled:
>
> Z -> M
> Z -> I
> Z -> R
> M <-> M
> I <-> I
> R <-> R
> Z <-> Z
>
> The output is
> ...
>
> Normalized Residuals
> Min. 1st Qu. Median Mean 3rd Qu. Max.
> -7.3300 -0.2750 -0.2670 -0.1290 -0.0369 9.0300
>
> Parameter Estimates
> Estimate Std Error z value Pr(>|z|)
> 0.0021625 0.00017037 12.693 0 M <--- Z
>
> Iterations = 13
>
>
> In "Structural Equation Modeling With the sem Package in R" by John  
> Fox is stated that there should be an output for each external  
> variable.
>
> Where is my fault, that I receive the output only for the first  
> variable?
>
>
> Thanks for your help,
> Luba
>
>
>
>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.

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