OpenMx Help

hi all,
I started a wikipedia page for OpenMx,

Feel free to dig in

http://en.wikipedia.org/wiki/OpenMx

Hi,
on an i7 windows machine, I installed R 2.12.1 and try to install OpenMx from a stick, as the machine has no internet.

I downloaded OpenMx_1.0.6-1581.zip and in R (32 bit version) install using

install.packages(pkgs="d:/camelia/OpenMx_1.0.6-1581.zip",repos=NULL).

The install results in: package OpenMx successfully unpacked and MD5 sums checked.

Library(OpenMx) results in
Error: package 'OpenMx' is not installed for 'arch=i386'

I also tried this with R 2.12.2 (32 bit version).

I though I was following instuctions from a previous response to a similar question.

Hi (Michael)

When I run models/nightly/BootstrapParallelNightly.R

I get:

> modelResults <- mxRun(topModel, silent=TRUE, suppressWarnings=F)
Error in checkForRemoteErrors(val) :
5000 nodes produced errors; first error: unused argument(s) (useOptimizer)

Has there been a change which affects this argument?

Cheers
Mike

Code as below. I think it is due to a non positive definite covariance input. When this is fixed, all is fine.

A pop -up says R for windows GUI front end has stopped working.

require(OpenMx)

varnames<-c("BIC1","SSC1","BIC2","SSC2");
dataMZ<-dataDZ<-matrix(diag(1,4),nrow=4,ncol=4,dimnames=list(varnames,varnames));
dataDZ[1,2]<-dataDZ[2,1]<-1.2;

p<-2;
pstar<-p*(p+1)/2;
diagind<-(diag(p)==1);

nMZ<-84;
nDZ<-33;
varnames<-c("BIC1","SSC1","BIC2","SSC2");

LA<-mxMatrix(type="Lower",nrow=p,ncol=p,free=T,values=0,
label=paste("a",1:pstar,sep=""),name="LA");

Hello, not sure this is the best place for this question, but here goes.

I have a growth curve and I'm using the age at assessment as a definition variable in the factor loadings. There is missing data, both in the observed variables and the definition variables. It's an ACE twin model. The script is pasted below.

I am getting an error message I've never seen before:
------begin output-------
growthMalesFit <- mxRun(growthMales)
Running growthMales
Error in .subset(x, j) : invalid subscript type 'list'
------end output--------

Can anyone explain? Thanks for your time!

Hello everybody,

I'm new at the forum and a newbee with OpenMx and SEM modelling, so my excuses if there may be some stupid questions I gonna ask :-)

Here comes my Problem: I try to write a script that automatically searches the best free parameter and fits it until all significant parameters are fittet. Just like the OU AM option of LISREL. However, it takes quite a while over it, and with more complex models its probably going to take days...

What I'm currently doing is in words and pseudo-code
1. compute the log-likelihood of a null-model:

I am running a series of models on the same dataset. I have eight binary manifest variables, one latent variable and twelve groups. I am fixing the means and variances of the manifests and estimating the thresholds. The series of models differ in the following way.
1 - common parameter (lambda) for all manifest variables but separate thresholds (tau - eight values)
2 - common lambda but separate tau for all items in each group (96 taus)
3 - separate lambda for each group (12) and separate tau (96)
4 - separate lambda for each manifest (8) with 8 tau