OpenSEM Forums
JuanJMV
Joined: 07/20/2016
Moderation Model
Hi everyone,
I am trying to fit a moderation model. I have modified one script but in this script the moderation variable is the same for twin1 and twin 2 (age). I want to fit a moderation model with 1 variable with different values for twin1 and twin2 (like IQ). I have done all the changes but I am not sure if it is correct. Specially this line:
meanG <- mxAlgebra( expression= cbind((int + DR1),(int + DR2)), name="expMeanG" )
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Jason Gawke
Joined: 11/25/2017
"Traditional" SEM versus piecewise SEM -Costs and Benefits
Hello!
I recently came across an article of Lefcheck (2016) covering an alternative way of evaluating SEM models, namely piecewise SEM
Link: https://arxiv.org/ftp/arxiv/papers/1509/1509.01845.pdf
ECTore
Joined: 11/06/2017
Direction of causation model
Hello,
I have a question regarding the Direction of Causation (DOC) model. I have found a very useful script at the following link and I'm trying to modify it according to my dataset: http://ibg.colorado.edu/cdrom2016/verhulst/Causation/DOC%20student.R.
I have 2 observed variables (x and y, both continuous) and I would like to verify if their association is causal (i.e. if x causes y. The inverse direction is not possible as x comes before y).
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krzysiek
Joined: 09/05/2013
mxCompare function
Hi,
I tried to compare two CFA models using the mxCompare function. Unfortunately, I received the message:
Error in refSummary$modelName : $ operator is invalid for atomic vectors
At first I thought I had some code error but I run an example located in the help for mxCompare function, that is:
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Fengxia
Joined: 11/02/2017
Bivariate Cholesky - Continuous & Ordinal some errors
Hello,
I am trying run bivariate cholesky model analyses with my data in OpenMx2.5.0 recently. But I've got a couple of questions:
1)When I ran the code "CorFit <-mxRun(CorModel, intervals=F)", I got error message"Error in eval(result, envir = env) : object 'MZ.rMZ' not found".
JuanJMV
Joined: 07/20/2016
Sex differences in bivariate model
Hi everyone,
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likelycandidate
Joined: 09/28/2017
Exclamation points indicating
I am estimating twin data using the standard model (http://openmx.psyc.virginia.edu/docs/OpenMx/2.7.9/GeneticEpi_Path.html).
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koak
Joined: 05/10/2012
Deleting attachments from posts
Hello
Does anyone know how I can delete attachments that I put on replies to posts on the forum? There are a couple I would like to delete, but at the moment cannot even view them in the reply posts (so no attachment is up with the post).
Thank you for your assistance
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chancey
Joined: 09/09/2017
Another CI problem w/ ordinal ACE model
Hi all,
It appears my 95% CI problems for a series of ordinal ACE models I'm running is not solved after all. Specifically, while CIs for my AE and CE submodels appear to be fine, the ACE CIs return an error (shown in bold below).
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lior abramson
Joined: 07/21/2017
bivariate Cholesky descomposition for dummies
Hi,
I have a longitudinal dataset on twins at the age of 6 and 9 years. For the purpose of examining change and stability in genetic and environmental effects, I would like to conduct a Cholesky decomposition analysis, allowing girls and boys to differ in their ACE components and including one categorical covariate in the analysis.
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