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UGC NET 1996
Q.1 :- There are a total of 50 relevant document in a collection. In response to a query,only 30 document are retrieved, of these ,only 10 were relevant.What is the recall percentage.
Ans:-
A} 20%
B} 33%
C} 40%
D} 60%
Ans :- B} 33%
Dear lis professionals,
Can anyone tell me how to get this answer?
Is their any method?
Ans:-
A} 20%
B} 33%
C} 40%
D} 60%
Ans :- B} 33%
Dear lis professionals,
Can anyone tell me how to get this answer?
Is their any method?
Views: 915
Replies to This Forum
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Permalink Reply by Langmuanjohn Tonsing on
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hello Sangeeta,
Let me give a try
Formula is Recall = Number of relevant result retrieve / Number of non-retrieve document + Number of relevant result retrieve
so, Number of relevant result retrieve=10,
Number of non-retrieve documents=20 (50-30=20)
Recall=10/20+10
=10/30
= 0.33
=0.33*100=33% (i.e. 33/100=0.33)
This is wat i think according to the formula, if it is wrong let me know.
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Sori, the last line " =0.33*100=33% (i.e. 33/100=0.33)" should be =0.33 =33% (i.e. 33/100=0.33).
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Permalink Reply by Vishal Sharma on
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10*100/30=33.33%
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Dear Vishal Sharma
Can you please explain in details?
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Permalink Reply by Dr.Harmanpreet Singh Sandhu on
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Very Good Question asked, with regards to upcoming pattern of the UGC NET June 2012. Recall percentage is the percentage of documents retrieved which were of actually requested or relevant documents with reference to the query.
To find out the Recall % = Total no. of relevant documents delivered / Total no. of documents deliverd * 100
i:e 10/30*100 = 33.33 %
When searching in google we don't know the total relevant documents uploaded on the net ..... so the recall % is found out by this formula only.
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Dear Harmanpreet,
Can you also please give the formula for precision?
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Permalink Reply by Sangeeta Dubey on
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Lot of thanks for your opinion.
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welcome ma'am
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Permalink Reply by K. Nagaraja Rao on
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According to me: Recall is intersection of relevant documents and retrieved documents divided by relevant documents in the system:
thus the intersection gives only 10 out of 50 relevant documents. 1/5*100
Which is 20%. To get 33%, the question should say 30 relevant documents from a total collection.
- formula taken from wikipedia.
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Thank you for your efforts sir.
I ll check it. n inform you.
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