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.

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As I write, the first day of 2014 is fading and the new year will quickly become just a fact along the way. The reprieve from emails and demands that the holidays permit will be a distant memory. And big data will grow bigger and bigger still and require more and more help from cool research synthesis procedures and meta-analytic statistics. That's why we are here. I am teaching a graduate seminar this spring on the subject, at the University of Connecticut, and I've asked…

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Posted by Blair T. Johnson on January 1, 2014 at 4:30pm

Meta-Analysis: The Original 'Big Data'

I'm winding down after a productive sabbatical leave and of course summer's waning days. I should be working on that new course preparation (yikes, I'm teaching in a week!), but I wanted to say something about trends in recent months (and years) connected to Big Data in the media and science.

It strikes me that the original instantiation of big data is meta-analysis. Isn't it the goal of meta-analysis to pool all the relevant data into one…

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Posted by Blair T. Johnson on August 19, 2013 at 8:00am

Mastering Meta-Analysis

Most of what scholars do hinges on having sufficient skill to create meaningful assessments of knowledge and the evidence base that underlies it. Meta-analysis is a skill set you can develop if you work at it with enough deliberative practice. How much deliberate practice does it take?…

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Posted by Blair T. Johnson on December 30, 2012 at 4:00pm

Our Communal Collective

It's sunny as I write you from my home office in mid-September, where I work at home during my sabbatical leave. As you probably know, sabbaticals are a periodic break from the regular hum-drum of academic life in order to focus more concertedly on other goals, mainly scholarly.

Popular belief has it that "sabbatical" is just another word for "vacation," but it is not true, well at least not for me: It is true that I am teaching no courses until next fall (and trying hard not to think…

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Posted by Blair T. Johnson on September 20, 2012 at 3:30pm

Latest Activity

Nerea Becerra joined Tania's group
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Heterogeneity

Tips, techniques, and procedures to evaluate the extent to which effect size magnitude varies across a series of studies.
May 16
Nerea Becerra is now a member of Meta-Analysis Resources
May 16
Fantasy T. Lozada is now a member of Meta-Analysis Resources
May 15
Kevria replied to Kevria's discussion computing 95%CI of the I^2 statistic; and publication bias in the group Heterogeneity
"Sincerely thanks so much for the informative and concise explanation!! May I further ask few follow-up questions? 4) Should I^2 be computed when k = 2, but both studies are from the same article? e.g. two independent samples reported in the…"
May 10
Kevria updated their profile
May 10
Mike Cheung replied to Srikanth Parameswaran's discussion MASEM: "Cov" is not positive definite in the group Meta-analytic structural equation modeling
"Hi Srikanth, I think that this issue should have addressed at http://openmx.ssri.psu.edu/node/4218 Best,Mike"
May 9
Mike Cheung replied to Mei Yi Ng's discussion NA in lower bound and upper bound of mediation effect in the group Meta-analytic structural equation modeling
"Hi Mei Yi, I think that I have replied some of your issues at http://openmx.ssri.psu.edu/node/4244 If not, please post another one. Best, Mike"
May 9
Mike Cheung replied to Srikanth Parameswaran's discussion NA in Indirect Effects for 95% likelihood based CI’s metaSEM in the group Meta-analytic structural equation modeling
"Hi Srikanth, I think that most of these issues should have been addressed in http://openmx.ssri.psu.edu/node/4237 Best,Mike"
May 9
Blair T. Johnson replied to Kevria's discussion computing 95%CI of the I^2 statistic; and publication bias in the group Heterogeneity
"With 1), right I^2 can only be calculated when k>1. With 2), according to Higgins and Thompson's (2002) formulation, I^2 values below zero are rounded up to zero. With the second 2), it looks like a calculation error. With 3), for PET-PEESE,…"
May 9
Kevria added a discussion to the group Heterogeneity
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computing 95%CI of the I^2 statistic; and publication bias

Dear all,I am working on a manuscript of my meta-analysis on effectiveness of a program. As indicators of heterogeneity in the effect size estimates, I have obtained the Q statistic and the I^2 statistic from the program Comprehensive Meta-Analysis (CMA) 3.0. Now I am using the formula on page 123 of Borenstein, Hedges, Higgins, & Rothstein (2009) to compute the 95% confidence intervals of the I^2 statistics. But some problems occur.1) When there is only 1 study (k=1), should we (or can we)…See More
May 9
Blair T. Johnson replied to Srikanth Parameswaran's discussion MASEM: "Cov" is not positive definite in the group Meta-analytic structural equation modeling
"Sorry about the delay in posting your submission! "
May 9
Srikanth Parameswaran added 2 discussions to the group Meta-analytic structural equation modeling
May 9
Blair T. Johnson replied to Mei Yi Ng's discussion NA in lower bound and upper bound of mediation effect in the group Meta-analytic structural equation modeling
"Sorry so slow in posting!"
May 9
Kevria joined Tania's group
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Heterogeneity

Tips, techniques, and procedures to evaluate the extent to which effect size magnitude varies across a series of studies.
May 9
Mei Yi Ng added a discussion to the group Meta-analytic structural equation modeling
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NA in lower bound and upper bound of mediation effect

Dear Mike and MASEM users, I am testing the same mediation model with several different datasets. Each dataset contains data on a different candidate mediator and has different number of study matrices with different patterns of missing data.For some of the datasets, tssem1 and tssem2 seem to run perfectly well, openmx status=0, no error or warning messages, and there are ubound and lbound for me to interpret the indirect effect and direct effect. For other datasets, openmx status=0, but I see…See More
May 9
Atsushi Sakuraba added a discussion to the group Software for Meta-Analysis
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MA of rare events

What software or methodology do you recommend in performing meta-analysis of studies with rare events. I am assessing 30 RCTs with most studies that have no events in both groups (double zero).  Adding 0.5, M-H, Peto? I cam across exactmeta in R that does not artificially add corrections. Any software that can easily perform these is preferred as I am a novice! Any suggestions are welcome.See More
May 9

Forum

Know Your Limitations: "Data" and "Big Data" vs. "Statistics" and "Models" and the Necessity of Good Theory

If you are reading this blog, you like numbers. Perhaps you even love them. Even if you are a dedicated qualitative researcher, I’d urge you to continue reading; this blog might be even more valuable to you. And if you are a quant geek, you might…Continue

Tags: science, data science, theory, statistics, conceptual

Started by Blair T. Johnson Sep 6, 2014.

Role of methodological quality in meta-analysis 1 Reply

For a few years now, I have been doing some work related to the methodological quality (MQ) of meta-analyses and of the studies they integrate, which have both shown an increasing presence in scientific literature. As Rob Low, Hayley MacDonald and I…Continue

Tags: methodological quality, simple slopes, interactive approach, meta-regression, OQAQ

Started by Blair T. Johnson. Last reply by Blair T. Johnson Aug 26, 2014.

Post No Bills (here unless it is about meta-analysis generally; but do so in specific items to groups)

The forum is a little like a blank wall that is irresistible: It just seems to attract comments. So, let me start with a little humor:…Continue

Tags: groups, meta-analysis.ning.com

Started by Blair T. Johnson Jan 5, 2014.

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