You don't appear to be defining Z here.
Might that be the problem?
Or, I, M, and R may not be defined either. It is unclear. What does
mod.cov look like?
On Jul 20, 2009, at 11:11 PM, Stein, Luba (AIM SE) wrote:
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-boun...@r-project.org [mailto:r-help-boun...@r-
project.org] Im Auftrag von Jarrett Byrnes
Gesendet: Montag, 20. Juli 2009 18:25
An: Stein, Luba (AIM SE)
Cc: r-help@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]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
