OpenMx Help

Hi all

I'm new to OpenMx. Actually I'm trying to convert some SEMs written in Stata into R for a module that I am helping to deliver, and for better or worse, we have chosen OpenMx as the R package to use.

It is a very simple path analysis. In Stata the code is just


ssd init BMI SO RT SE
ssd set correlations ///
1 \ ///
0.43 1 \ ///
0.16 0.53 1 \ ///
0.02 -0.18 -0.25 1

sem ///
( SE <- RT ) ///
( RT <- SO ) ///
( SO <- BMI ) ///
, standardized nocapslatent


Hi, I'm a new user with an extremely basic installation question. Basically, the installation instructions provided on the website say:

"open up an R session and copy the following line into the R command line and press return.

source('http://openmx.psyc.virginia.edu/getOpenMx.R')

A few lines of R output will scroll by and you will be asked which type of OpenMx Installation you would like. "

Hello everybody,
I try to do a Monte Carlo simulation with a very simple SEM. I've got 2 latent variables and 3 categorical indicators with 3 categories per latent variable (see the attachment).
If I run my model (code is also in the attachment) I receive different error messages:
-"In model 'Title' NPSOL returned a non-zero status code 1. The final iterate satisfies the optimality conditions to the accuracy requested..."
-"In model 'Title' NPSOL returned a non-zero status code 6. The model does not satisfy the first-order optimality conditions..."

I'm trying to run the CT-SEM examples from Oud et al. I'm running on an 8-core system that's running Red Hat EL5. I compiled R locally (2.15.2 Patched (2013-01-22 r61734)) and I'm running OpenMx 1.3.2. I've attached the CT-SEM files (containing data, input, and continuous_time function) and the output when R crashes.

Hi all,

I install the OpenMx for windows today. I found that I cannot run several example scripts:

http://openmx.psyc.virginia.edu/svn/trunk/demo/BivariateSaturated_MatrixRawCholesky.R
http://openmx.psyc.virginia.edu/svn/trunk/demo/BivariateHeterogeneity_PathRaw.R

The error messages are

Error in mxModel("bivSat6", mxMatrix(type = "Full", nrow = 2, ncol = 2, :
could not find function "mxFitFunctionML"

Error in mxModel("bivariate Heterogeneity Path Specification", mxModel("group1", :
could not find function "mxFitFunctionAlgebra"

Hi all,

I am trying to run multivariate ACE model for binary data, but I keep on getting error message...

This is my script:

require(OpenMx)

# ------------------------------------------------------------------------------
# PREPARE DATA

OMdataset <- read.csv("twins-only.csv", header=T,)
# sep = ",", dec = ".", quote="\"", na.strings="-99"

OMdataset$TONSa -> OMdataset$T_01
OMdataset$TONSb -> OMdataset$T_02

OMdataset$ADENa -> OMdataset$A_01
OMdataset$ADENb -> OMdataset$A_02

OMdataset$GROMa -> OMdataset$G_01
OMdataset$GROMb -> OMdataset$G_02

My install attempt on Windows 7 using R 2.15.1 is failing with the message below. Can you suggest solutions? Thanks!

> source('http://openmx.psyc.virginia.edu/getOpenMx.R')
trying URL 'http://openmx.psyc.virginia.edu/packages/bin/windows/contrib/2.15/OpenMx_1.3.2-2301.zip'
Content type 'application/zip' length 7964184 bytes (7.6 Mb)
opened URL
downloaded 7.6 Mb

Error in read.dcf(file.path(pkgname, "DESCRIPTION"), c("Package", "Type")) :
cannot open the connection
In addition: Warning messages:
1: In unzip(zipname, exdir = dest) : error 1 in extracting from zip file