Machine Learning: Exceeding Chance Level By Chance

Possible warnings for machine learning studies? "Chance" classification depends on the number of samples - if samples are not infinite, it may be higher than expected.

UPDATE: The general consensus seems to be that permutation testing, as commonly done, is valid and avoids the potential problems laid out by the authors.

Hermione was the real hero of the Harry Potter saga

Harry has his moments but the kid had a rough and abusive childhood and so his principal talent is getting angry and doing stupid impulsive shit. Mainly, he's manipulated by Voldemort and Dumbledore into doing exactly what they want him to do, and he plays the part splendidly. On the other hand, Hermione is an amazing witch and has a real choice as to how she wants to apply her considerable talents. And she chooses goodness, friendship, and doing the right thing over comfort, power, and even her own family, every time.