"In February 2020, Zak and Philip Gibbs published an assessment applying Bayes' theorem to the question of her authenticity, claiming "a 99.99% chance of an identity switch in the case of Mme Calment". François Robin-Champigneul and Robert Young commented on Zak's and Gibbs' findings, Robin-Champigneul noting that it "appears to be in fact a subjective and nonrigorous analysis" and Young that "[i]gnoring the actual facts of the case and stringing together opinions in a 'Bayesian' analysis are to merely misuse a mathematical tool". Young found that "a very solid case that Jeanne was 122 years has already been made" but that biosampling still was needed to test "for biomarkers of extraordinary longevity". Robin-Champigneul found that "the hypothesis of an identity swap with her daughter appears not even realistic given the context and the facts, and not supported by evidence" [1]
"In February 2020, Zak and Philip Gibbs published an assessment applying Bayes' theorem to the question of her authenticity, claiming "a 99.99% chance of an identity switch in the case of Mme Calment". François Robin-Champigneul and Robert Young commented on Zak's and Gibbs' findings, Robin-Champigneul noting that it "appears to be in fact a subjective and nonrigorous analysis" and Young that "[i]gnoring the actual facts of the case and stringing together opinions in a 'Bayesian' analysis are to merely misuse a mathematical tool". Young found that "a very solid case that Jeanne was 122 years has already been made" but that biosampling still was needed to test "for biomarkers of extraordinary longevity". Robin-Champigneul found that "the hypothesis of an identity swap with her daughter appears not even realistic given the context and the facts, and not supported by evidence" [1]
[1] https://en.wikipedia.org/wiki/Jeanne_Calment