(9) [Avatar] Offline
On page 69 ( 73 in the pdf) The formula for precision and recall are the same. But the text description indicates that these are slightly different concepts and should have a different formula.
Both show : tp / ( tp + fp )
460365 (1) [Avatar] Offline
Good Point John. Formula for Precision is correct.
For Recall is should be tp/(tp+fn)

I hope this will be corrected.

Nishant Shukla (52) [Avatar] Offline
Thank you for catching this mistake! All fixed!
467323 (1) [Avatar] Offline
In V9 error again in recall formula.
Nishant Shukla (52) [Avatar] Offline
You're right... It seems like Manning didn't update the figures to chapter 4. I'll check with them right away.