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.
