From: Modeling and mining term association for improving biomedical information retrieval performance
# | unigram | bigram | trigram | ||||||
---|---|---|---|---|---|---|---|---|---|
 | T 1 | .. | T n | T n +1 | .. |
|
| .. |
|
 | k 1 | .. | k n | k 1 k 2 | .. | k n -1 k n | k 1 k 2 k 3 | .. | k n -2 k n -1 k n |
1 | 1 | .. | 1 | 0 | .. | 1 | 0 | .. | 1 |
2 | 1 | .. | 1 | 1 | .. | 1 | 1 | .. | 1 |
.. | Â | . | . | Â | . | . | Â | . | . |
N | 0 | .. | 0 | 0 | .. | 1 | 0 | .. | 1 |