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Kwabenaaaddo
Joined: 02/01/2021
Help: TSSEM Mediation model
Dear community,
I trust you are doing well. Thank you very much for your immense work in structural equation modelling. I'm contacting you because I'm currently working on a research project that involves implementing a two-step structural equation model.
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Bo Wang
Joined: 03/19/2024
warning message when using metaSEM
We want to use metaSEM to conduct a mediation model based on four samples using TSSEM. There was a warning message in the summary of the output from the tssem1 function. The following is the R script we used to run the analysis:
### Insert correlation matrices
M2_Study_2a <- data.matrix(data.frame(
IV = c(1, 0.236, 0.360),
M = c(0.236, 1, 0.247),
DV = c(0.360, 0.247, 1)
))
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ambrush
Joined: 01/15/2024
NA values of standard errors, z values, and p-values in my metasem output (simple mediation model)
Dear Mike and all,
First off, thanks for this great forum and for directing me to ask questions here!
I used the metasem package to test some simple mediation models (IV->Med->DV, with the direct effect included). The script is attached.
sharmel
Joined: 07/31/2023
The goal of moderator analysis in metaSEM::wls()
Dear Mike and Colleagues,
My understanding is that moderator analysis at the 2nd stage of metaSEM approach using `metaSEM::wls()` involves multi-group analysis.
Thus, as a user I have to `subset` my data by categories of my moderator, and fit the **same model syntax** to each subset as shown below.
brendan
Joined: 09/21/2023
Is osmasem3 in the github version of metaSEM?
Hello,
Are the osmasem3L functions still available in the github repository?
I can see the functions were removed(?) in the most recent commit.
(If they are available, I respect that they are still in development)
Regards
brendan
Joined: 09/21/2023
MetaSEM with odds ratios
I have a series of studies that have reported their results as odds ratios. I can calculate the effect size and sampling variance and perform a series of meta-analyses for each predictor-outcome relationship. Now I would like to fit a path model to the data.
I assume that to do this, my next step is to convert the odds ratios to r values?
Can someone point me in the direction of what I need to do next to generate the required correlation matrix?
Thankyou in advance
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Jimxxxx
Joined: 08/26/2023
OSMASEM Interaction between Moderators
Dear Dr. Cheung and Colleagues,
I attempted to include an interaction term and other moderators in a path model.
However, it produced unusual estimates and the following message: "The model does not satisfy the first-order optimality conditions to the required accuracy, and no improved point for the merit function could be found during the final linesearch (Mx status RED)."
Could you please provide me with some suggestions?
I have attached the R code and the dataset.
Thanks for your time and patience.
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nguyennghia130…
Joined: 07/27/2023
Perfect fit
Hi,
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Xijian Zheng
Joined: 06/10/2023
The tssem1 runs very slowly. tssem1 does not work when using a random effects model
Dear Dr. Cheung,
Hello, recently I want to use TSSEM to determine the structure of a scale. I am pooling 30 correlation matrices of size 38x38 using the 'tssem1' function. However, tssem1 runs quite slowly, taking at least 6 hours for each computation.
Do you have any suggestions to make it run faster?
hampusgronvall
Joined: 05/24/2023
Saving umxReduceACE output
Hi again all, very sorry for double posting, but I figured since it's two different questions they should be in two separate topics.
Using umxReduceACE on an ACE-model will print out a wonderful comparison between different models, but is there any way to save it?
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