The following table shows the output of an information retrieval system on two queries (Q1 and Q2). You can assume that there are no relevant documents in ranks lower than the top 10 ranks shown. Crosses (X) correspond to relevant documents, dashes (–) to irrelevant documents. Rank Q1 Q2 1 X – 2 – X 3 – – 4 X X 5 X – 6 – X 7 – X 8 – – 9 – X 10 – X a )  What are the precision and recall for each query?

Principles of Information Systems (MindTap Course List)
12th Edition
ISBN:9781285867168
Author:Ralph Stair, George Reynolds
Publisher:Ralph Stair, George Reynolds
Chapter11: Knowledge Management And Specialized Information Systems
Section: Chapter Questions
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The following table shows the output of an information retrieval system on two queries (Q1 and Q2). You can assume that there are no relevant documents in ranks lower than the top 10 ranks shown. Crosses (X) correspond to relevant documents, dashes (–) to irrelevant documents.

Rank

Q1

Q2

1

X

2

X

3

4

X

X

5

X

6

X

7

X

8

9

X

10

X

a )  What are the precision and recall for each query?

b) What is the mean average precision (MAP) of the system?

 

 

 

 

 

 

 

 

 

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