OpenMx Help
abhworthington
Joined: 06/09/2010
Bivariate ACE model fit causes R front-end shutdown
Hello all,
I'm experiencing a somewhat frustrating error in an attempt to run some bivariate Cholesky ACE models using ordinal data. Rather than use raw data inputs (there are different numbers of thresholds across variables, so coding is tricky), I have taken the "easy" way and simply created polychoric correlation matrices for the variables of interest. However, when I attempt to fit the model, R crashes.
EDG
Joined: 06/03/2011
How does SEM computational complexity in OpenMx scale with sample size?
Sorry if this is a question that is answered elsewhere, but does anyone know how the time to compute a full SEM in OpenMx scales with the number of subjects that are used?
Thanks!
Sabha
Joined: 05/18/2010
GUI option for OpenMX
I am just wondering if any one developing a GUI for OpenMX.
Atleast an option in future would be of great value.
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wuhao_osu
Joined: 09/07/2010
How to obtain saturated model fit?
Hello, guys,
When using the MLObjective, how to obtain the saturated model fit? Is it somewhere in the output slot? If discrepancy function value can be found, that is even better. I think most softwares when analyzing a sample covariance matrix would return the discrepancy function value.
Thanks.
Hao
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Mariano
Joined: 05/21/2011
Error in readRDS ()
Hi,
I'm a beginner user of OpenMx.
I need help for the following error. It appear after any script, such as univariate regression, regression by path analysis by means of covariance or raw data calls, etc.
I've played with several forms, and check package loadings, including fields, psych, OpenMx, and general packages for R.
Please, if you can give me any tip, I'll be happy.
Thanks,
Mariano Ordano
lillo.org.ar
conicet.gov.ar
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dchackett
Joined: 05/19/2011
Issue with indexing in MxMatrix
So, given an mxMatrix, testMatrix, with values:
@values
X Y G
X 1 2 3
Y 4 5 6
Then:
testMatrix[c('X'), c('X', 'G')]
yields:
@values
[,1]
X 1
G 3
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a.ortega
Joined: 02/05/2011
Error: "non-conformable arguments"
Hello everyone!
I am trying to fit a latent (linear) growth model (with genetic and environmental influences, ACE) using ordinal twin data (MZ and same-sex + opposite-sex DZ; 6 groups), which includes 3 variables, 7 categories in each of them. The definition of the thresholds (invariant thresholds) seems to be difficult and the execution of the script returns:
"Error: The algebra 'ACE.ThInc' in model 'lgcOrdACE' generated the error message: non-conformable arguments"
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a.ortega
Joined: 02/05/2011
Error: NPSOL returned a non-zero status code 3
Hello everyone!
I have prepared a model to estimate genetic and environmental influences (ACE) using a cholesky decomposition with ordinal twin data: 3 phenotypes, 7 categories in each of them. The sample is is divided in 6 groups (and so is the script), according to zygosity and sex: MZ men, DZ men, MZ women, DZ women, DZ man-woman and DZ woman-man. The script including this multivariate threshold model takes about an one and a half hour to be computed, and returns the following error:
garverapgar
Joined: 05/05/2011
Error in substituteOperators(as.list(retval)) : internal error -3 in R_decompress1
Hello all,
I've been running models successfully, but today I started getting the above error message. My code didn't change, but I may have accidentally installed a new version of OpenMx before running my model. Could someone tell me what this error message is about? If there isn't an easy fix, is there a way I can go back to an older version?
Thank you!
Christine
jarrode28
Joined: 03/01/2010
model "does not contain a RAM objective function"
Hi,
I'm having some trouble and have been getting an error message that reads:
"Error: The RAM model 'MZ' does not contain a RAM objective function."
What has me perplexed is that I specify what OpenMx should take into account when evaluating the model (for both groups in a BG study):
mxFIMLObjective(covariance="R", means="M", dimnames=manifests, thresholds="expThresholds")
mxAlgebra(expression=MZ.objective + DZ.objective, name="minus2sumll" ),
mxAlgebraObjective("minus2sumll")
Thank you for any insight.