OpenMx Help

I have a difficulty of installing OpenMx in version 2.15 and version 3, I have types library (OpenMx) but this gives a warning sign!

Hi,

I'd like to know if it's possible to estimate a sem model with ordinal and binary indicators using a WLS estimator based on the raw data including the sampling weights. The data set contains a weight column with an individual weight for each case and I don’t need multilevel modeling.

I am currently using the R package lavaan for SEM analysis. As lavaan does not support this functionality, I’m considering changing to OpenMx.

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