---
title: "John Ioannidis"
chunk: 3/5
source: "https://en.wikipedia.org/wiki/John_Ioannidis"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T03:42:37.127948+00:00"
instance: "kb-cron"
---

=== Neuroscience ===
Along with colleagues, Ioannidis has performed empirical evaluations and meta-research assessments of large numbers of scientific studies in neuroscience and have found that lack of power is a very common problem, leading to both false-negatives (the inability to discover true signals) and false-positives (finding spurious signals).

=== Economics ===
In empirical assessments of all meta-analyses that have been conducted on economics topics, Ioannidis and colleagues have found that most of the studies in these fields are small and under-powered. Using bias detection and correction methods, they have concluded that nearly 80% of the reported effects in the empirical economics literature is exaggerated; typically by a factor of two, and with one-third inflated by a factor of four or more.

== Editorial appointments ==

Ioannidis has served on the editorial board of a number of scientific journals, including the European Journal of Clinical Investigation (editor-in-chief, 2010–2019), BMC Medicine, International Journal of Epidemiology, Journal of the American Medical Association, Journal of Clinical Epidemiology, Journal of Infectious Diseases, International Journal of Molecular Epidemiology and Genetics, International Journal of Epidemiology, Journal of Translational Medicine, Journal of Evaluation in Clinical Practice, Clinical Chemistry, Physiological Reviews, Royal Society Open Science, Research Integrity and Peer Review, BioMed Central Infectious Diseases, Biomarker Research, Diagnostic and Prognostic Research, PLoS Medicine, PLoS Biology, The Lancet, Annals of Internal Medicine, JNCI, and Science Translational Medicine.