OpenMx Help

I am trying to get the confidence intervals for the free parameters in an ordinal ACE model. But it seems I screw it up. The range of confidence intervals is quite wide. So I have questions about confidence intervals in OpenMx.

How does OpenMx calculate the confidence intervals? I didn't get much information from 'OpenMx Manual' or 'OpenMx User Guide', but I found some in 'MxManual'. Are the principles of OpenMx and Mx same?

If it's just a silly code error, my code is below.

Any help would be appreciated!

univACEOrdModel <- mxModel("univACEOrd",
mxModel("ACE",

Hello,

First, thanks for providing such a useful software package!

Second, I am having some trouble getting my model to finish running, and since I have to manually stop the script, I don't get any helpful output that would help me debug. Please find attached my script.

Hi,

Thanks to the script below (suggested by Athanassios Protopapas and further developed by Paolo Ghisletta, thank you!!!) I was able to obtain a large number of fit indices, but I still don't know how to get (a) the 90% confidence interval for RMSEA, (b) p close (the test of the null hypothesis that RMSEA (in the population) in less than .05), and (c) the residual correlation matrix. Can anyone help me?

Latest versions and updates for OS, R and R Studio:

OS: Mac OS X 10.6.8
R: 2.14.1
RStudio: 0.95.261

When trying to run the install command: source('http://openmx.psyc.virginia.edu/getOpenMx.R')

from the R prompt nothing happens after it loads the tcltk interface:

> source('http://openmx.psyc.virginia.edu/getOpenMx.R')
Loading required package: tcltk
Loading Tcl/Tk interface ...

and when running the install command from the R prompt in RStudio I get a tcltk interface but when I clock the "OK" button under the choice of sequential/multicore choice buttons nothing happens.

Attempting to download to R 2.14.1, I receive the following message. New to R, so I'm pretty sure it's a simple error on my part...

> source('http://openmx.psyc.virginia.edu/getOpenMx.R')
Error in file(filename, "r", encoding = encoding) :
cannot open the connection
In addition: Warning message:
In file(filename, "r", encoding = encoding) :
unable to resolve 'openmx.psyc.virginia.edu'

Any help would be much appreciated.
Thanks

I realize I am asking for instability using development versions, but thought I would mention that running an OpenMx model kills R.

Here is my system info:

R Under development (unstable) (2012-02-03 r58258)
Platform: x86_64-pc-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats graphics grDevices utils datasets methods base

other attached packages:

I have just got this error message. What I have done is

1. define a model say, A, which includes sub-models.
2. define A0<-mxModel(A, name="A0")
3. add a suffix "0" to all parameters in A0, so that A and A0 are exactly the same but with independent parameters
4. define a bigger model M<-mxModel("M", A, A0, some constraints and objective function over A and A0)

Hi,

I am trying to install OpenMx on a linux red-hat 64 bit system, but I get an error message (see summary below and full output in attached file). I have tried this under R version 2.12.2 and also the latest R version R 2.14.2.
The same error message occurs when installing from the source.
Can you help?

Thanks in advance,
Rachel

> source('http://openmx.psyc.virginia.edu/getOpenMx.R')
trying URL 'http://openmx.psyc.virginia.edu/packages/src/contrib/OpenMx_1.2.0-1926.tar.gz'
Content type 'application/x-gzip' length 7212786 bytes (6.9 Mb)
opened URL

After using omxGraphviz() to output a .Dot plot from my OpenMx model, I get a diagram of the model, but no parameter estimates are overlaid on the diagram. Is there a way to do this? Thanks in advance.

Hi all,

I ran a relatively simple path analytic model with four manifest variables, three causal paths, and one unanalyzed relationship. The model has 2 df. I used the code below but got the following error message:

"In model 'Apgar Model 2' NPSOL returned a non-zero status code 1. The final iterate satisfies the optimality conditions to the accuracy requested, but the sequence of iterates has not yet converged. NPSOL was terminated because no further improvement could be made in the merit function (Mx status GREEN). "