Ambiguous definitions

A lot of regressions get run using crime statistics. Maybe, just maybe, crime statistics are not so objective (HT: Damian Bickett):

For 17 months, New York police officer Adrian Schoolcraft recorded himself and his fellow officers on the job, including their supervisors ordering them to do all sorts of things police aren't supposed to do. For example, downgrading real crimes into lesser ones, so they wouldn't shop up in the crime statistics and make their precinct look bad.

The Washington Post ...