Exercise 1.2
Consider these documents:
Doc 1 breakthrough drug for schizophrenia
Doc 2 new schizophrenia drug
Doc 3 new approach for treatment of schizophrenia
Doc 4 new hopes for schizophrenia patients
Question:
Draw the term-document incidence matrix for this document collection.
Draw the inverted index representation for this collection, as in Figure 1.3 (page 7).
Answer:
- Term document incidence
| Term/Document | Doc 1 | Doc 2 | Doc 3 | Doc 4 |
|---|---|---|---|---|
| approach | 0 | 0 | 1 | 0 |
| breakthrough | 1 | 0 | 0 | 0 |
| drug | 1 | 1 | 0 | 0 |
| hope | 0 | 0 | 0 | 1 |
| new | 0 | 1 | 1 | 1 |
| patient | 0 | 0 | 0 | 1 |
| schizophrenia | 1 | 1 | 1 | 1 |
| treatment | 0 | 0 | 1 | 0 |
- Inverted index
| approach | 3 | |||
|---|---|---|---|---|
| breakthrough | 1 | |||
| drug | 1 | 2 | ||
| hope | 4 | |||
| new | 2 | 3 | 4 | |
| patient | 4 | |||
| schizophrenia | 1 | 2 | 3 | 4 |
| treatment | 3 |