Third Party Software
forscher
Joined: 03/05/2013
Error when attempting REML estimation with some sample data
Hi metaSEM users,
As I have posted previously in this forum, I am using metaSEM to conduct a network meta-analysis. I have been attempting to fit a metaSEM model using both ML and REML estimation using some sample data from a meta-analysis of the effectiveness of diabetes interventions. I was able to successfully conduct the analysis using ML estimation, but for some reason when I attempt to obtain a fit using the reml() function, I obtain the following error:
Running Variance component with REML
Error in running the mxModel:
dwils03
Joined: 12/05/2012
Summary Output Interpretation
Hello Forum Members,
I have run into another point of confusion in my inaugural use of the MetaSEM package for a MASEM project. I posted one brief question a few months ago and received an excellent and helpful answer. I'm hoping again to benefit from the forum's deeper experience using the MetaSEM package.
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dstanley4
Joined: 08/07/2012
metaSEM: Possible feature request
Hi Everyone,
I keep enjoying using metaSEM. Right now, I'm using meta3 to conduct a meta-analysis where the studies are grouped by country. I would like to get a meta-analytic estimate of the mean for each country. In HLM, I would ask for the Level-3 residuals and combine that with the Intercept to get the meta-analytic mean for each country.
Is it possible to do this with metaSEM? If not, is there any chance this could be added as a feature in future updates!
Cheers,
David
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tbates
Joined: 07/31/2009
Function to add up paths (path tracing rules function)
Anyone know of a function to take a RAM model and an entry and exit point and output a total effect?
i.e., given A model m1 = A<->B; B->C; A->C
pathEffect(m1, from="A", to= "C")
Would output the product of paths
Aschoemann
Joined: 02/11/2013
simsem and semTools
Welcome to the simsem and semTools forum! simsem and semTools are R packages (available on CRAN) that provide additional functionality for structural equation modeling in R.
simsem provides comprehensive simulation functionality for structural equation modeling. simsem allows data generation based on a user specified model, analyses of generated data, and storage and processing of simulation results. Data generation and analysis models using can be specified using lavaan syntax, or OpenMx model specifications, or a set of matrices.
For further details on simsem see: http://simsem.org
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forscher
Joined: 03/05/2013
Imposing constraints on the between-studies covariance matrix
Hi metaSEM users,
I'm currently trying to use metaSEM to implement a network meta-analysis (i.e., a meta-analysis of different treatment comparisons; see Salanti, 2012). One important aspect of multivariate implementations of network meta-analysis is that the between-studies takes on a particular structure (see Lu & Ades, 2004). For example, given AB, AC, and AD, one common way to constrain the matrix is to do the following (basically, set the correlation between any two treatment comparisons equal to .5):
AB AC AD
dwils03
Joined: 12/05/2012
Model Specification Question
Hello Helpful Forum Members,
My co-authors and I have been very happy with the metaSEM R package, and we're grateful to the authors and contributors for their hard work in developing and maintaining the package.
I've been stuck for a while at a crucial part of "stage 2" of the TSSEM approach, and I'm hoping that someone here can help me make sense of it. Specifically, I'm confused about the syntax used to specify the structural model to be fit to the pooled data derived in stage 1.
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dstanley4
Joined: 08/07/2012
Error running analysis after deleting rows from data frame
Hi Everyone,
Using metaSEM and loving it. But, I've encountered a problem using metaSEM with a data frame after I have deleted rows from that data frame -- or created a new data frame that is a subset of the rows in the original data frame. Fortunately, I've also discovered a work around - but the error is an odd one. I have attached the relevant files, but I'll describe it in detail here.
timo
Joined: 10/22/2012
Onyx Beta 0.9-534 released
Ωnyx (Version 0.9-534), the graphical user interface for SEMs with automatic code generation to OpenMx code is released. You may download Ωnyx for free at onyx.brandmaier.de. Any comments about your experiences with Ωnyx are welcome at this forum.
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dstanley4
Joined: 08/07/2012
Error when trying to run my data but not sample data
Hi Everyone,
Just trying out metaSEM. Analyzing the sample data worked perfectly. Unfortunately, the error below occurs when I try to run meta3 with my data. Note that there are no missing or NA values in my data. Any help in trying to get this to run would be greatly appreciated!
Cheers,
David
First few row of myData (unsorted):
yCol xCol country yColSamplingVar
1 0.35000 39 51 0.0020375922
2 0.48780 35 53 0.0090533427
3 0.24500 36 14 0.0040732539
4 0.41600 60 33 0.0039870241