Third Party Software
Forscher_CG
Joined: 03/21/2016
asycov missing values
Hi Mike and other users,
I have a question concerning the the function asycov in the preparatory process for a Meta-Analysis using SEM and the WLS-Function. I have a manually created pooled correlation matrix (6x6) as there are some correlations I didn’t compute by myself. The problem is, that there are 4 missing values which resulted in the following error term when trying to calculate the covariance matrix with the asycov function:
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forscher
Joined: 03/05/2013
Differences between meta-analytic indirect effects estimated using meta() and tssem2()
Hi Mike and metaSEM users,
First of all, thank you, Mike, for maintaining such an active presence on this forum! It makes a HUGE difference as a user to be able to get questions answered from the package maintainer within a pretty reasonable timeframe. :)
I had another question about the meta-analytic indirect effects that are estimated by indirectEffect() (and then meta-analytically combined using meta() ).
dwils03
Joined: 12/05/2012
R-squared (Explained Variance) for DVs in a Stage 2 MetaSEM
Hi All,
I need to calculate variance explained for my endogenous latent variables after fitting the pooled data to a structural model in Stage 2 (using tssem2). I have specified a model (all observed variables) with 3 dependent variables (two of which are mediators, with one key "final" dependent variable).
(I guess I'll drop in the A matrix so you know what it looks like:)
KSSE Prestige EnjHlpg BossExp ExtrMotiv Recip TrustB ATS ITS KS
SophieIL
Joined: 11/05/2015
tssem1 Inverse variance weighting
Hello!
I'm trying to work with the metaSEM package for the first time, and I really appreciate it so far!
Why is weighting of the ES by the inverse variance in tssem1 only implemented for fixed effects? Aside from the results of the SEM structure in tssem2, I would like to give readers of my results both FE and RE estimates of the pooled correlation matrix, but I want both to reflect the variance/sample size and they wouldn't be comparable if only one of the methods uses inverse weighting by the variance.
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rabil
Joined: 01/14/2010
semPlot Does Not Work with OpenMx 2.0
Has any one else noticed that semPlot no longer works with OpenMx for version 2? I've used it to make path diagrams with versions of OpenMx before 2.0.
Is there a better tool for making path diagrams?
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k.corker
Joined: 10/05/2015
tssem1 random effects model: diag vs. symm
Hi Mike,
Thanks very much for your excellent metaSEM package. I have successfully wrangled my data into the necessary format and run a fixed effect model and then a random effects model with the "diag" option. The data is 37 samples (ranging in size from 28 to 1589) of 8 variables (and none of the samples have missing data; all samples provide all 28 correlations). I can't get the random effects model to run with the "Symm" option, and it is driving me nuts as to why this is the case. I get Open Mx error code 6, and all of the parameters come out NA.
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jode
Joined: 08/21/2015
Moderation analysis
Hi metaSEM users, hi Mike,
I am just wondering if and how to apply a moderator analysis in metaSEM. Can I apply the approach you describe in your book beginning on page 170? I would like to test a moderating effect between two effect sizes by treating one variable as moderator. Or is there any other approach?
Thanks for your help.
Johannes
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jode
Joined: 08/21/2015
Mediation analysis
Hi,
I would like to perform a mediation analysis by defining the indirect effects with mx.algebras in the wls() funktion.
I tried mx.algebras= list( ind=mxAlgebra(b410*b14, name="ind"))), where b410 and b14 refer to the paths in the A matrix. However, I get the following error in the analysis:
Error in running the mxModel:
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tbates
Joined: 07/31/2009
tutorials on umx
There is a growing set of tutorials on using umx here
http://tbates.github.io
There's also a paper under review at Journal of Statistical Software, and you can get a pre-print here:
https://www.dropbox.com/s/fhyj8ps2cnfzu6m/bates.pdf?dl=1
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tbates
Joined: 07/31/2009
installing umx
you can install umx as with other packages on CRAN
install.packages("umx")
library("umx")
If you want the bleeding-edge version, install from github
devtools::install_github("tbates/umx")
library("umx")
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