secion 4.2.2 precision and recall using the same formula

The Author Online Book Forums are Moving

The Author Online Book Forums will soon redirect to Manning's liveBook and liveVideo. All book forum content will migrate to liveBook's discussion forum and all video forum content will migrate to liveVideo. Log in to liveBook or liveVideo with your Manning credentials to join the discussion!

Thank you for your engagement in the AoF over the years! We look forward to offering you a more enhanced forum experience.


john.watson@gmail.com (10) Offline	Mar 22, 2017 @ 8:19 PM #1 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) Offline	Mar 23, 2017 @ 3:42 PM #2 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) Offline	Apr 5, 2017 @ 8:30 PM #3 Thank you for catching this mistake! All fixed!
467323 (1) Offline	May 9, 2017 @ 5:38 AM #4 In V9 error again in recall formula.
Nishant Shukla (52) Offline	May 10, 2017 @ 1:07 AM #5 You're right... It seems like Manning didn't update the figures to chapter 4. I'll check with them right away.