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UGC NET

Dear Friends ,

Please give your valuable suggestion and the formula of below question.

Q1. A retrieval system retrieves a total of 50% documents, out of these 40 are irrelevant.Another 10 document which where relevant were not retrieved . The Precision percentage of that query would be ?

Ans.

A} 40%

B} 20%

C}60%

D} 80%

Given ans is :- B} 20%

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Permalink Reply by Sangeeta Dubey on February 13, 2012 at 18:22

Lot of thanks Balvant sir

Permalink Reply by K. Nagaraja Rao on February 13, 2012 at 20:34

I think Precision is defined as intersection of relevant documents and retrieved documents divided by retrieved documents.

In this question there are 20 relevant documents and only 10 documents are retrieved (50-40), which is divided by total retrieved documents which is 50. ie., 10/50 =1/5 ie., 20% precision.

This will become easy to understand when diagrams are drawn.

Permalink Reply by Sangeeta Dubey on February 13, 2012 at 22:39

Sir,

I got 2 questions related this type. kindly see d previous one also. You can see second ques. in Discussion tittle is UGC NET 1996.

May be you will get more ideas.so pls share

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