Real data is messy. ...It's all very noisy out there. Very hard to spot the tune. Like a piano in the next room, it's playing your song, but unfortunately it's out of whack, some of the strings are missing, and the pianist is tone deaf and drunk- I mean, the noise! Impossible!
Tom StoppardThe idea that all the people locked up in mental hospitals are sane while all the people walking about are mad is merely a literary cliche, put about by people who should be locked up. I assure you there is not much in it. Taken as a whole, the sane are out there the sick are in here. For example you are in here because you have delusions that sane people are put in mental hospitals.
Tom Stoppard