On Sage’s Covid models
In the confusion that has arisen from the demonstrable inability of a certain type of mathematical model to predict the time course of the SARS-CoV-2 pandemic, many have taken to reciting – with a variable mixture of glee and sympathy – that ‘all models are wrong but some are useful’. I have never been comfortable with this statement (it doesn’t really deserve to be called an aphorism) and even less so the smugness with which it is typically pronounced. One might as well say all metaphors are wrong but some are useful. ‘Wrong’ seems to be employed here to suggest that ‘statistical or scientific models always fall short of the
