Prof. John O'Quigley publishes proportional-hazards reanalysis of shift chart

Prof. John O'Quigley, Emeritus Professor of Statistics at UCL, publishes a peer-reviewed proportional-hazards / beta-binomial reanalysis of the shift-attendance chart shown to the jury in the Letby trial. With hours-worked properly controlled, the probability of 'anomalous presence' reduces to roughly 10 percent — not the inference of guilt the prosecution chart implied. The analysis sits alongside Prof. Richard Gill's earlier published critique and the Royal Statistical Society's reissued April 2026 statement on selection bias in healthcare-serial-killer prosecutions.