Why learning lessons from PISA is as hard as predicting who will win a football match

by David Spiegelhalter, Winton Professor for the Public Understanding of Risk, University of Cambridge I am a statistician and I love bucket-loads of data. So I jumped at the chance to make a BBC Radio 4 programme on PISA’s testing of 500,000 school students across 65 countries. But after talking to many people and examining past PISA […]