Corrigendum to 'an Agent-Based Model of the 2020  International Policy Diffusion in Response to the COVID-19 Pandemic with Particle Filter, 27 (2) 3, 2024'

Yannick Oswald; Nick Malleson; Keiran Suchak

doi:10.18564/jasss.5848

Corrigendum to 'an Agent-Based Model of the 2020 International Policy Diffusion in Response to the COVID-19 Pandemic with Particle Filter, 27 (2) 3, 2024'

Yannick Oswald^a

Nick Malleson^b

Keiran Suchak^b

^aUniversity of Lausanne, Switzerland; ^bUniversity of Leeds, United Kingdom

Journal of Artificial Societies and Social Simulation 29 (1) 2
<https://www.jasss.org/29/1/2.html>
DOI: 10.18564/jasss.5848

Received: 07-Nov-2025 Accepted: 07-Nov-2025 Published: 31-Jan-2026

Abstract

This corrigendum refers to 'An Agent-Based Model of the 2020 International Policy Diffusion in Response to the COVID-19 Pandemic with Particle Filter', Journal of Artificial Societies and Social Simulation, 27 (2) 3, 2024.

Keywords: Agent-Based Modelling, Policy Diffusion, Peer Mimicry, Data Assimilation, Particle Filter, COVID-19

Corrections Summary

An error occurred in Equation 1 of the article’s text in Oswald et al. (2024) but not in the model code, so the study’s results are unaffected.

Error: A correction to Equation 1 of the original article

The error was that the first two numerator terms in the similarity metric (income similarity and political similarity) should have been taken as absolute values rather than signed differences; otherwise, the equation does not measure distance correctly. The third term is positive by definition, and hence no absolute value is required.

References

OSWALD, Y., Malleson, N., & Suchak, K. (2024). An agent-based model of the 2020 international policy diffusion in response to the COVID-19 pandemic with particle filter. Journal of Artificial Societies and Social Simulation, 27(2), 3. [doi:10.18564/jasss.5342]