"For example, if a group of doctors collect and analyze data on clinical outcomes, they are likely to learn something together that helps them to do their jobs. But if the doctors’ bosses then decide to tie bonuses or professional advancement to improving these numbers, unintended consequences will predictably occur. For example, several studies have found evidence of cardiac surgeons refusing to operate on the sickest patients for fear of lowering their reported success rates.
In my book Messy, I spent a chapter discussing similar examples. There was the time the UK government collected data on how many days people had to wait for an appointment when they called their doctor, which is a useful thing to know. But then the government set a target to reduce the average waiting time. Doctors logically responded by refusing to take any advance bookings at all; patients had to phone up every morning and hope they happened to be among the first to get through. Waiting times became, by definition, always less than a day."
Trechos retirados de "The Data Detective" de Tim Harford.
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