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Table 4 Correlations at the amino acid level as characterized by the χ2 measure (PDB_SELECT set).

From: Protein secondary structure prediction for a single-sequence using hidden semi-Markov models

  Helix Strand Loop
Separation χ 2 # of pairs χ 2 # of pairs χ 2 # of pairs
1 1854.34 118,324 2579.85 60,423 9600.85 154,404
2 7008.83 103,853 1832.78 44,121 5774.58 124,249
3 2454.03 89,414 1116.65 30,909 4828.13 100,325
4 5095.27 77,302 535.02 20,336 2276.21 80,930
5 2052.68 67,036 461.70 12,584 1298.16 66,109
6 1295.46 57,602 398.44 7361 950.66 54,993
7 2196.94 49,017 392.93 4196 895.42 46,391
8 627.00 41,350 355.81 2292 761.48 39,611