OpenMx 2.0 Discussion
dtofighi
Joined: 10/12/2009
covariance matrix of coefficient estimates
I am wondering how to get covariance matrix of parameter estimates (e.g., inverse of Fisher's information matrix) in an SEM with OpenMx. I have included a sample code for a path model below. For example, I would like to get covariances between estimates of b1, b2, and cp that include in the covariance matrix.
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PaulTwin
Joined: 01/29/2017
Factor scores following WLS estimation
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tbates
Joined: 07/31/2009
Is it possible to mix definition variables and constants in an mxMatrix?
The value of each covariate is read from the data as a definition variable ( "data.cov1", "data.cov2" etc) in a matrix named "defCovs"
As the betas are all in one matrix, I'd like to also have an "intercept" column, fixed at 1 in the the defCovs matrix to simplify the arithmetic.
Question: Is it legal to include fixed values along with definition variables in an mxMatrix?
so:
dtofighi
Joined: 10/12/2009
Program gets stuck
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EWilliams
Joined: 03/08/2016
Optimizer + confidence intervals
OpenMx version: 2.5.2 [GIT v2.5.2]
R version: R version 3.1.2 (2014-10-31)
Platform: i386-w64-mingw32
Default optimiser: NPSOL
I have been running some bivariate twin models without any problems with the NPSOL optimizer. After installing the latest OpenMx version, however, I keep getting the error : "Error in runHelper(model, frontendStart, intervals, silent, suppressWarnings, : NPSOL is not available in this build. See ?omxGetNPSOL() to download this optimizer".
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bwiernik
Joined: 01/30/2014
Bug with summary.MxModel in saved workspace
When I open a saved R workspace that have MxModels saved it and load the OpenMx library, the summary() command doesn't work properly. Instead of running the summary.MxModel method, it just runs the generic summary method, giving something like:
Length Class Mode
1 MxRAMModel S4
If I first open R, load OpenMx, then load the saved workspace into the environment, summary() works as expected.
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pjohnson
Joined: 09/19/2009
Compiling OpenMX on RedHat 6.2
4.4.7 does not get very far at all.
I fiddled around with the environment lots of ways, various GCC. This system says it has boost-devel-1.50 installed.
Attached error from GCC-4.9.2 points at boost and Rstan headers.
What do you think?
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bwiernik
Joined: 01/30/2014
Constraining parameters using mxAlgebra bracket notation
Here is the script:
circumplex <- umxRAM("circumplex", data=mxData(mat[vars,vars],type="cov",numObs=N),
umxPath(var = vars, fixedAt=0),
umxPath(var = latentvars, labels=paste("communal",vars,sep="")),
umxPath(latentvars, to=vars, values=.6, labels=paste("scaling",vars,sep="")),
britt01
Joined: 08/04/2015
Error with 2.6.9 vs 2.5.2
I am running an ACE analyses on ordinal variables and I am finding that my script is failing with an error about stack imbalance when I use OpenMx 2.6.9 but not when I use OpenMx 2.5.2 Below is the Error I received, and I have attached a script that recreates the error when using 2.6.9 and finishes without error when using 2.5.2 adapted from Hermine Maes example script (http://ibg.colorado.edu/cdrom2016/maes/UnivariateAnalysis/onea/oneACEoa.R)
Thanks in advance for all of your help!
Britt
Error
Calls: mxTryHardOrdinal -> mxTryHard
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Arin A
Joined: 07/04/2016
MetaSEM Analysis /NA
In a research project, we aim at examining a predictive model in different contexts. The model includes 9 predictors (among which 7 are mediators also), a covariate, and a dependent variable. Our model fits the four contexts very well. We would like to conduct a metaSEM which would allow us to summarise the results of our studies.
We have followed the code developed by Cheung (2016), however, our output gives us error variances which are negative, and the confidence intervals and the p-values are NA. Moreover, whenever we try to run a REM, R stops responding.
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