OpenMx Help

Hi,

Is anybody knows how to model correlated residuals of some manifest variables in OpenMx? Can you give me any example of mxPath()
application to this issue?

best regards,
Krzysztof

Hello,

I have been attempting to install OpenMx this week and have been getting the following error suggesting that the file cannot be downloaded:

source('http://openmx.psyc.virginia.edu/getOpenMx.R')
Warning in install.packages(pkgs = c("OpenMx"), repos = repos) :
argument 'lib' is missing: using 'C:\Users\Name\Documents/R/win-library/2.10'
trying URL 'http://openmx.psyc.virginia.edu/packages/bin/windows/contrib/2.10/OpenMx_1.3.2-2301.zip'
Error in download.file(url, destfile, method, mode = "wb", ...) :

Hello!

I use Australian twin sample biometric data to test my scripts, but there is something unclear with zygosity variable: it has 10 levels instead of 5 (as declared on help page). How should I actually interpret these levels?

Hi,

I have tried to run the code as documented here:
http://openmx.psyc.virginia.edu/svn/trunk/demo/UnivariateTwinAnalysis_MatrixRaw.R

Don't know why but I always get the following error message:

Error in mxModel("twinACE", mzModel, dzModel, mxAlgebra(expression = MZ.objective + :
could not find function "mxFitFunctionAlgebra"

Any idea what is wrong here? Many thanks in advance!

FYI, whenever I run an mxModel that includes mxRObjective() for its objective function, and then try to get its summary output, it throws this error:
Error in match(x, table, nomatch = 0L) :
no slot of name "dims" for this object of class "MxRObjective"

--Rob K.

I would like to constrain the loading between two variables to the values of a 3rd, where that 3rd is generated by additional structures. I guess I need a way to reference the estimated latent directly, but as it stands I seem to be only able to reference it's parameters.

I've been mainly generating the model with mxPath rather than mxMatrix, but this can change as needed...

Cheers for any suggestions!

So I just started learning SEM this past year, teaching myself with some guidance from my advisor. I learned on AMOS, but I'm trying to teach myself OpenMX (just started last week).

I installed R 32 bit -- I was already running R 64 bit on Windows 7. I launched R and did:

> source('http://openmx.psyc.virginia.edu/getOpenMx.R')
Installing package(s) into ‘C:/Users/Placidia/Documents/R/win-library/2.15’
(as ‘lib’ is unspecified)
trying URL 'http://openmx.psyc.virginia.edu/packages/bin/windows/contrib/2.15/OpenMx_1.3.2-2301.zip'
Content type 'application/zip' length 2367042 bytes (2.3 Mb)
opened URL
downloaded 2.3 Mb

package ‘OpenMx’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in

I adapted OpenMx ordinal threshold model example code to estimate a model with 5 raters using a 5-point ordinal scale. (The code uses threshold deviations.) The model converges (after some tweaking of starting values) with no errors and no warning messages - this is on a computer running Ubuntu 13.04 and the latest version of OpenMx. The same model was estimated using MPlus - both yield very similar factor loading estimates and threshold estimates (although MPlus used weighted least squares - ML wouldn't work).