Meta-Analysis Resources

Tools for Those Who Summarize the Evidence Base

Resources and networking for those who conduct or interpret meta-analyses related to any phenomenon that is gauged in multiple studies.

Hamed Qahri Saremi
  • Springfield, IL
  • United States
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Mike Cheung replied to Hamed Qahri Saremi's discussion Error code 6 for stage 1 random-effects TSSEM in metaSEM 0.9.6 in the group Meta-analytic structural equation modeling
"Dear Mei Yi, Could you email me the data and R code so that I can check it? Best,Mike"
Oct 22, 2016
Mei Yi Ng replied to Hamed Qahri Saremi's discussion Error code 6 for stage 1 random-effects TSSEM in metaSEM 0.9.6 in the group Meta-analytic structural equation modeling
"Dear Mike and other users, I am encountering the same problem. I have a smaller sample of 15 studies with a 5-variable matrix (1 binary variable, 4 continuous variables), but all 15 studies contribute data to every cell. Every study matrix is…"
Oct 22, 2016
Hamed Qahri Saremi replied to Hamed Qahri Saremi's discussion Error code 6 for stage 1 random-effects TSSEM in metaSEM 0.9.6 in the group Meta-analytic structural equation modeling
"Thank you, Mike! I see the limitation."
Nov 11, 2015
Mike Cheung replied to Hamed Qahri Saremi's discussion Error code 6 for stage 1 random-effects TSSEM in metaSEM 0.9.6 in the group Meta-analytic structural equation modeling
"If there is only 1 study, that correlation will be used in fitting the structural model. It is then difficult to call it a "meta-analysis" as there is only 1 study. Mike"
Nov 11, 2015
Hamed Qahri Saremi replied to Hamed Qahri Saremi's discussion Error code 6 for stage 1 random-effects TSSEM in metaSEM 0.9.6 in the group Meta-analytic structural equation modeling
"Thank you very much, Mike. So, if I use the resulted pooled correlation matrix in stage 2 of TSSEM, does it mean that for the data points with one study, the correlation will be used as a covariance toward estimating the structural model?"
Nov 11, 2015
Mike Cheung replied to Hamed Qahri Saremi's discussion Error code 6 for stage 1 random-effects TSSEM in metaSEM 0.9.6 in the group Meta-analytic structural equation modeling
"Hi Hamed, There is only 1 study in many of these cells. It is not possible to estimate the heterogeneity variances. Regards,Mike pattern.na(MASEM$Data, show.na = FALSE)   x1 x2 x3 x4 x5 x6 x7 x8 x9x1  4  2  1  1 …"
Nov 11, 2015
Hamed Qahri Saremi added a discussion to the group Meta-analytic structural equation modeling
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Error code 6 for stage 1 random-effects TSSEM in metaSEM 0.9.6

Hello Mike and others;I am trying to conduct random-effects TSSEM on a dataset of 61 studies (data set, "hamed.dat", is attached), using metaSEM 0.9.6, Openmx 2.3.1, and R 3.2.2 (2015-08-14). However, I am stuck in stage 1 of the random-effects analysis with error code "6". I even changed the default optimizer in Openmx from "SLSQP" to "NPSOL", but no luck. Regardless of changes I make to my data, it seems that I can not produce error code "0" or "1" in stage 1 of random-effects TSSEM. This is…See More
Nov 11, 2015
Hamed Qahri Saremi updated their profile
Nov 8, 2015
Hamed Qahri Saremi joined Mike Cheung's group
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Meta-analytic structural equation modeling

A technique to synthesizing correlation/covariance matrices for the purpose of fitting structural equation models.
Nov 7, 2014
Hamed Qahri Saremi is now a member of Meta-Analysis Resources
Nov 7, 2014

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