Question

A database contains 80 records on a particular topic, a search was conducted on that topic and 60 records were retrieved. Of the 60 records retrieved, 45 were relevant. Calculate the precision and recall scores for the search.

Answer 1

"This is a clear illustration of Recall and precision which are inversely related. If A=the number of relevant records retrieved, B=Number of relative records not retrieved and C=Number of irrelevant records retrieved, A=45,B=35(8-45) C=15(60-45) hence Recall will be (45/(45+35))* 100=56% and Precision (45/(45+35))* 100=75%. Essentially, the optimal result; high recall with high precision is difficult to achieve

"

Answer 2

Explanation:

TP = 40

FP = 10

FN = 15

The precision P is P = TP/( TP + FP)

= 40/( 40 + 10) = 4/ 5

The recall R is R = TP/( TP + FN)

= 40/( 40 + 15) = 40/55