Meta-Analysis Magic

Welcome to my blog, Meta-Analysis Magic! I discuss meta-analysis stuff and sometimes measurement issues.

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When Evidence Synthesis Obscures: A Critique of Meta-Meta-Analyses
Methods
Meta-Analysis
Meta-Meta-Analyses
Meta-analyses are often seen as the gold standard of evidence synthesis–systematic, quantitative, and rigorous (at least when done well). So it’s no surprise that some…
Matthew B. Jané
May 23, 2025
Individual Person Data (IPD) Meta-Analysis with Beta Regression in a Repeated-Measures Cross-Over Design
Individual Participant Data
Repeated Measures
Meta-Analysis
I worked on a meta-analysis along with my good friend [Tylor J.…
Matthew B. Jané
Oct 31, 2024
Generalized Additive Models (GAMs) for Meta-Regression using brms
Generalized Additive Models
Meta-regression
A GAM is a linear or generalized linear model that allows you to model non-linear relationships using splines, smooth functions that allows to model the “wiggliness” in the…
Matthew B. Jané
Sep 24, 2024
A Response to Jonathan Haidt’s Response
meta-analysis
social media
I want to thank Jonathan Haidt and Zach Rausch for engaging with my critique of their re-analysis of Ferguson’s…
Matthew B. Jané
Sep 2, 2024
A Statistical Interrogation of “The Case for Causality, Part 1” by Rausch and Haidt
meta-analysis
social media
I don’t know anything about the literature on social media and mental health so my focus on this post is to interrogate the statistical approach taken by the article written…
Matthew B. Jané
Aug 29, 2024
Respectful Operationalism, Realism, and Models of Measurement Error in Psychometrics
psychological measurement
measurement error
Full disclaimer: I am not well-versed in these issues, and I am not a philosopher. The purpose of this post is for me to articulate my own thought process, rather than have…
Matthew B. Jané
Feb 2, 2024
A Response to Jonathan Haidt’s response
sampling error
artifacts
In this post we will discuss how squared effect sizes such as \(\eta^2\) and \(R^2\) are distributed and the implications of this when conducting a meta-analysis
Matthew B. Jané
Nov 6, 2023
Calculating Pre/Post Correlation from a Paired T-Test
repeated measures
pre/post correlations
test statistics
In this post we will go over how to convert a t-statistic from a paired t-test into a pre/post correlation. This is useful when change score standard deviations are unknown.…
Matthew B. Jané
Sep 13, 2023
Approximating Standard Deviation from Inter-Quantile Range
standard deviations
approximations
Occasionally researchers report inter-quantile ranges (e.g., inter-quartile range) to measure the spread of the data. Since meta-analysts need standard deviations to…
Matthew B. Jané
Sep 10, 2023
Calculating Pre/Post Correlation from the Standard Deviation of Change Scores
repeated measures
pre/post correlations
Welcome to the first blog post of Meta-Analysis Magic! In this post we will go over a couple of ways to directly calculate pre/post correlations from alternative…
Matthew B. Jané
Sep 8, 2023
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