1. Calculating Accuracy, Precision and Recall
PREDICTION
true false
true
REALITY a b
false
c d
(a+d)
accuracy: “what percent of the prediction were correct?”
(a+b+c+d)
(a)
precision: “what percent of positive predictions were correct?”
(a+c)
(a)
recall: “what percent of positive cases were caught?”
(a+b)
Samstag, 19. Januar 2008 1