# Lösungsvorschlag Information Retrieval FS18: Unterschied zwischen den Versionen

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If you disagree with the solution, please state so by appending to it with your reasoning.

1. C
2. A
3. B
4. C
5. B
6. C
7. B
8. C
9. C
10. A
11. D

1. 1 2 3 4 5 6
2. None
3. 4 6
4. 1 2 3 4 5 6
5. 4
6. 1 2 3 5
7. 1 2 3 5
8. 1 5 6

## II Pre-processing and term vocabulary

1. A
2. C
3. D
4. D
5. C
6. C
7. A
8. C (changed from C to B, since the index described in A is called a "k-gram index", not a "bi-word index") (Elwin: I disagree, the index is called bi-word index, see Slide 143 in "Term Vocabulary". Since A and B are correct, C should be chosen)

1. 0
2. 2/3
3. 3/14
4. 1
5. 1/2
6. 1
7. 0
8. 0

1. 1
2. 1
3. 7
4. 0
5. 1
6. 10
7. 5
8. 10

1. C
2. A
3. D
4. D
5. B

## V Ranked Retrieval

1. 311
2. 0
3. 705
4. 320
5. 200
6. 30
7. 6 (2100), 5 (390), 1 (320)
8. 15*40 + 3*30 = 690
9. 0*30 + 11*30 = 330
10. 11*40 + 70*30 = 2540
11. 6 (2540)

1. A
2. B

1. B
2. C
3. A
4. D
5. A, C
6. C
7. A
8. B
9. C

1. A
2. A
3. C
4. B
5. A
6. B
7. C
8. A (81.8 %)
9. A
10. C
11. C
12. C
13. A