2023-11-30 ::: Fisman et al.’s Psi (Ψ) index is ill-defined and leads to absurd interpretations

By Joseph Hickey and Denis G. Rancourt

This report shows that modeling claims, based on a novel mathematical construction (Ψ), that unvaccinated people disproportionately contribute to the infection risk of vaccinated people are rigorously incorrect.

The report is published both by CORRELATION, and here: https://pubpeer.com/publications/3ACB55309DB4EF7D3518A4A5B2B65E#2 

The incorrect claims were made in the April 2022 article “Impact of population mixing between vaccinated and unvaccinated subpopulations on infectious disease dynamics: implications for SARS-CoV-2 transmission” by Fisman et al.

Hickey and Rancourt’s previous criticisms of the Fisman et al. article are listed below:

• 2023-10-31: J. Hickey & D.G. Rancourt, “Viral respiratory epidemic modelling of societal segregation based on vaccination status”, medRxiv preprint [See Appendix 3 of Version 1 of the preprint, in particular]
• 2022-04-30: Interview about Fisman et al. paper with Dr. Byram Bridle and Dr. Denis Rancourt, Trish Wood is Critical Podcast
• 2022-04-29: D.G. Rancourt & J. Hickey, “Fisman et al.’s main conclusion does not follow from their model”, e-Letter, CMAJ
• 2022-04-27: D.G. Rancourt & J. Hickey, “OCLA Statement on CMAJ Fisman et al. Article Claiming Disproportionate Infection Risk from Unvaccinated Population, and on Negligent Media Reporting”

Downloads:

• 2023-11-30-Fisman-et-al-Psi-is-ill-defined-and-leads-to-absurd-interpretations.pdf

Links:

• at PubPeer
• at CORRELATION

VIEW OF DOWNLOAD:
2023-11-30-Fisman-et-al-Psi-is-ill-defined-and-leads-to-absurd-interpretations.pdf