The Average Is Nobody's Result

In 2013 four researchers went back to a completed mammography study and asked it a question it had not been designed to answer. The original study had put 50 radiologists in front of 180 mammograms, twice. Once unaided, once with computer-aided detection marking suspicious regions. The finding was a null. On average, computer aid changed nothing measurable, and the profession moved on. Andrey Povyakalo and his colleagues at City University London reanalysed the data by splitting the readers…