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Table 8 Top 15 n-gram features from feature sets 1 and 2

From: Discovering and identifying New York heart association classification from electronic health records

Rank Feature set 1: Bag of words Feature set 2: n-grams
1 ii nyha class ii
2 iii class ii
3 iv nyha class iii
4 b class iii
5 428.0dd nyha class iv
6 428.0db class iv
7 chf nyha class ii
8 congestive nyha class 2
9 428.0 dc nyha class 3
10 lvad class
11 systolic chf
12 diastolic class 3
13 428.0bm class 2
14 c congestive heart failure
15 stage nyha class