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ou.yang@unimel…
Joined: 03/19/2022
Algorithm underlying omxMnor
Dear all,
I am currently using omxMnor to calculate the multivariate normal integral in my paper. Wonder what is the underlying algorithm implemented by omxMnor. Any references would be greatly appreciated!
Cheers,
Ou
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pehkawn
Joined: 05/24/2020
Fitting model with three latent variables and 16 ordinal and four continuous indicators
I am having trouble fitting a SEM with three latent variables with the following specification: An endogenous latent variable, created from four continuous manifest indicator variables, is regressed on two exogenous latent variables created from multiple ordinal manifest indicator variables. Prior to creating the SEM model I ran a CFA model, with similar specification, but where the three latent variables covary. I used the resulting factor loading values as a starting point for the SEM model.
pehkawn
Joined: 05/24/2020
Combining two single factor models into a two-factor model
Based on the [two-factor model](https://vipbg.vcu.edu/vipbg/OpenMx2/docs//OpenMx/latest/FactorAnalysis_Path.html#two-factor-model ) and [joint ordinal-continuous model](https://vipbg.vcu.edu/vipbg/OpenMx2/docs//OpenMx/latest/Ordinal_Path.html#joint-ordinal-continuous-data) examples in the documentation, I tried creating two single-factor models (one continuous and one ordinal), which I tried to combine in a new model. In the new model essentially just tried to add a covariance path between the latent variables.
pehkawn
Joined: 05/24/2020
Effects coding method in CFA
I am trying to run a CFA where one latent variable is regressed on four manifest variables. I am trying to constrain the pattern coefficients ($\lambda$) mean to equal one, according to [Kline's (2015, p. 200)](https://www.guilford.com/books/Principles-and-Practice-of-Structural-Equation-Modeling/Rex-Kline/9781462523344) *effects coding method*:
$$ \frac{\lambda_1 + \lambda_2 + \lambda_3 + \lambda_4}{4} = 1 $$
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pehkawn
Joined: 05/24/2020
Interactions in latent variable models
I am fairly new to SEM in general, and I've been trying to figure out the best approach to modeling interaction effects between latent variables in OpenMx.
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cjvanlissa
Joined: 04/10/2019
CRAN test failure
Dear OpenMx team,
As I'm sure you're aware, OpenMx and its dependencies have been scheduled for archival from CRAN. I was just wondering whether a response is underway on your side?
Hope you are all well; sincerely,
Caspar
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dr.gw
Joined: 09/09/2021
Error Code 6
Hi,
I have written up a script using a RAM formulation and so is maximizing the likelihood using the mxExpectationRAM() function with raw data. I have got a warning message with status code 6 when I ran my model in openMX. The model was identified, which was tested by mxCheckIdentification().
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lf-araujo
Joined: 11/25/2020
Cascade / stealth model script example for OpenMx
Hi all,
I hope everyone is healthy.
I have been looking into extended family design, starting with S Medland papers [1,2]. Also, M Keller have some basic scripts [here](http://www.matthewckeller.com/html/cascade.html) which does not specify Medland's model completely, nor the Stealth model. My question:
- Does anyone care to share a script example for training purposes on either/or models? Or point to where I can find these?
Many thanks,
Luis
**Edit**:
hansfredriksunde
Joined: 12/10/2021
Wrong estimates when using definition variables and WLS
Hi everyone!
ssciarra
Joined: 01/08/2021
Error only occurring on Amazon linux instance
I am trying to run simulations on an Amazon linux instance and get the following error when I use `mxAutoStart()` to generate starting values :
library(devtools)
#install_github("sciarraseb/nonlinSims", dependencies = T, force=T)
library(easypackages)
library(nonlinSims)
library(parallel)
library(tidyverse)
library(OpenMx)
library(data.table)
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