Meta-Analysis Magic

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

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Unjustifiable Methods and How I plan to fix this: a Response to Stein, Rausch, and Haidt

Part 3 of Haidt and Rausch’s response to the meta-analysis by Ferguson is now out and is written by Haidt’s analyst, David Stein. Stein is still running sub-group analyses…

Matthew B. Jané

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

A Response to Jonathan Haidt’s Response

I want to thank Jonathan Haidt and Zach Rausch for engaging with my critique of their re-analysis of Ferguson’s…

Matthew B. Jané

A Statistical Interrogation of “The Case for Causality, Part 1” by Rausch and Haidt

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

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

A Response to Jonathan Haidt’s response

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

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

Approximating Standard Deviation from Inter-Quantile Range

standard deviations

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

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