Third Party Software
Srikanth
Joined: 12/28/2016
"Cov" is not positive definite.
Dear Mike and Others,
I am trying to estimate a random effects tssem for my paper.I have read your book and related papers. I am following the wonderful resources provided by you and your team. My goal is to perform some moderator analyses using categorical variables, after I successfully run the tssem model.
- Read more about "Cov" is not positive definite.
- 1 comment
- Log in or register to post comments
Xie
Joined: 12/23/2015
A question about latent variables in MASEM
Hi Mike
- Read more about A question about latent variables in MASEM
- 1 comment
- Log in or register to post comments
Xie
Joined: 12/23/2015
Use MASEM to explore several potential mediators
Hi Mike,
I have reviewed several MASEM articles as well as the R code. I am excited that it could examine mediation model. However, I found the R code of meta-analytic structural equation modeling which examined only one mediator. Now I want to exam a structural model with three mediators by using MASEM. So, I am just wondering is that possible to use MASEM to explore several potential mediators. If so, please let me how to find the R code.
Thanks a lot,
Yu Xie
rafael.lionello
Joined: 11/22/2016
how to improve (poor) fit indices
Hi all, Hi Mike,
I want to test five rival conceptualizations of a construct (service quality) through path analysis with the two stage approach meta-analytic structural equation modelling (with the metaSEM in R). I am using a path analysis instead of a factor analysis since the dimensions' construct are discussed to be formative rather than reflective. In all five models, I have three or four exogeneous variables and one endogeneous variable (the endogeneous variable is the same for all models, that is, behavioral intention).
- Read more about how to improve (poor) fit indices
- 1 comment
- Log in or register to post comments
Rroquet
Joined: 11/18/2016
NA values in base model output and OpenMx status1: 5
I am currently in the process of running a meta analysis using the metaSEM package in OpenMx. As you can see in the first pass at the base model I am getting NA values for Std.Error, lbound, ubound, z value and Pr(>|z|) for both Tau2_2 and Tau2_3. In addition, the OpenMx status1: 5, which I found meant "5: means that the Hessian at the solution is not convex." However I am unclear how to resolve this as a problem.
forscher
Joined: 03/05/2013
Heterogeneity indices and constraints on the between-studies variance-covariance matrix
Hi all, hi Mike,
I am asking a question in reference to this project (https://osf.io/awz2p/). I am revising a paper based on the project in response to reviewer comments.
For most analyses in this project, we fit multivariate meta-analytic models, estimating 11 quantities across all studies. Of course, not every study contributes an estimate of each quantity, so the between-studies variance-covariance matrix is constrained such that all variances are equal and all covariances are equal. This ensures that the model is identifiable.
Xie
Joined: 12/23/2015
The minimum number of studies to examine the mediator using metaSEM
Dear Mike,
I'm Yu Xie. Now I am conducting a meta-analysis using metaSEM, examining a mediator between two variables. I only identify 3 studies in this meta-analysis. I am just wondering that is there any minimun number of studies to examine the mediator using metaSEM?
Best wishes,
Yu Xie
nastjuscha
Joined: 06/28/2016
Looking for a global factor for the latent factors
Dear Mike,
thank you very much for your metaSEM-package, I really enjoy working with it!
I tested a model with 8 variables and 3 latent factors and now I would like to check, if there is a common factor for these three latent factors at the superordinate level - is it possible with metaSEM? I was looking for specifications like Gamma matrix in LISREL, but I unfortunately couldn't find anything.
Thank you!
Best wishes,
Nastja
jasperd
Joined: 06/28/2016
Possible bug and question: Variable name interference with dummy variable name & Average effect size
Hi Mike,
I have two questions, both are related to finding the average effect size of categories in covariates with metaSEM. I've been trying to find the correct way to find the average effect sizes and have found a variety of results for different approaches. One of the reason for these differences seem to be related to my first question/issue, and may be a bug. The second question is simply about the correct way to find average effect sizes.
crystalzsq
Joined: 08/23/2016
missing data
How to deal with the missing data using MetaSEM package? (Almost all the variables have missing data and these data are missing at completely random)
- Read more about missing data
- 2 comments
- Log in or register to post comments