[Corpora-List] Precision and Recall

[Adam Funk]

[18/04/08 08:39] Daniel Zeman wrote:
> Thierry Fontenelle napsal(a):
>> Precision: The number of correct responses divided by the total number 
>> of actual responses.
>>
>> Recall: The number of correct responses divided by the total number of 
>> possibly correct responses.

> Alternative wording I usually tell my students:
> 
> P = number of things I correctly found / number of things I found
> R = number of things I correctly found / number of things I should have 
> found
> 
> ("correctly found" = "I found it" AND "I should have found it")

Here's another way to look at it, which I sometimes find useful:

P = true_positives / (true_positives + false_positives)

R = true_positives / (true_positives + false_negatives)


_______________________________________________
Corpora mailing list
Corpora at uib.no
http://mailman.uib.no/listinfo/corpora