Data mining Reddit posts reveals how to ask for a favor and get it

Re:Data mining Reddit posts reveals how to ask for a favor a... by andreasvc on Saturday May 24, 2014 @08:08PM (#7794904)

From the PDF you cite:

"Since the AUC is a portion of the area of the unit square, its value will always be between 0 and 1.0. However, because random guessing produces the diagonal line between (0, 0) and (1, 1), which has an area of 0.5, no realistic classifier should have an AUC less than 0.5."

So it appears that not 0.8 but 0.5 is the randomness threshold; therefore 0.7 is not so bad.

[ Parent | on HN ]

Re:Data mining Reddit posts reveals how to ask for a favor a... by taralx on Monday May 26, 2014 @08:42PM (#7802302)

Unfortunately not. IIRC, any classifier with AUC < 0.5 can be improved by just inverting its output. Real classification quality requires being significantly above 0.5 -- 0.8 is a common threshold.

[ Parent | on HN ]