Worse, it's about the easiest statistic to manipulate, if you know that is going to be a Key Performance Indicator. (Having said that, the mean is not difficul

Worse, it's about the easiest statistic to manipulate, if you know that is going to be a Key Performance Indicator. (Having said that, the mean is not difficult to manipulate) There's an important game theory issue to KPIs: - if everyone is behaving perfectly, then why bother checking the stat? - if someone is behaving maliciously, and wants to game the stat, will they be forced to actually improve the situation? A malicious actor barely has to break stride here.