Table 5 The representation ability of the N-Grams for the class
N-Grams | Class C1 | Class C2 | Difference (D) | \(D^2\) | \(D^3\) | \(D^4\) | Nature of the N-Gram |
|---|---|---|---|---|---|---|---|
\(t_{i}\) | 2.3 | 2.25 | 0.05 | 0.0025 | 0.000125 | 0.00000625 | Common |
\(t_{j}\) | 2.5 | 0.1 | 2.4 | 5.76 | 13.824 | 33.1776 | Rare |
\(t_{k}\) | 2.5 | 0 | 2.5 | 6.25 | 15.625 | 39.0625 | Very rare |
\(t_{l}\) | 0.05 | 0.01 | 0.04 | 0.0016 | 0.000064 | 0.00000256 | Sparse |