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Table 7 Performance of SAP4SS, SAP, OPUS-TASS (in columns OTASS), and SPOT-1D (in columns SPOT) when our testing proteins are grouped based on their lengths

From: Secondary structure specific simpler prediction models for protein backbone angles

Testing proteins \(\phi\) \(\psi\) \(\theta\) \(\tau\)
SAP4SS SAP OTASS SPOT SAP4SS SAP OTASS SPOT SAP4SS SAP SPOT SAP4SS SAP SPOT
Length Count MAE \(\Delta\)% \(\Delta\)% \(\Delta\)% MAE \(\Delta\)% \(\Delta\)% \(\Delta\)% MAE \(\Delta\)% \(\Delta\)% MAE \(\Delta\)% \(\Delta\)%
001–100 232 14.60 + 2.05 + 1.03 + 3.77 18.47 + 1.08 + 15.54 + 17.16 5.63 + 1.95 + 9.59 20.39 + 3.68 + 13.68
101–200 424 15.32 + 2.48 + 1.17 + 3.98 18.78 + 2.50 + 15.65 + 19.33 6.05 + 2.64 + 9.75 22.01 + 4.27 + 14.08
201–300 294 15.24 + 2.49 + 2.23 + 4.66 18.41 + 2.66 + 19.77 + 23.19 5.95 + 2.35 + 11.93 22.00 + 3.27 + 16.55
301–400 190 15.60 + 2.88 − 0.19 + 3.53 18.58 + 3.39 + 16.85 + 22.50 6.04 + 2.98 + 11.42 21.23 + 5.37 + 17.57
401–500 103 15.80 + 2.09 + 3.92 + 7.28 18.57 + 2.85 + 27.95 + 31.07 5.96 + 2.52 + 16.61 20.75 + 4.14 + 24.24
501–800 78 16.64 + 1.98 + 1.08 + 4.21 20.59 + 2.77 + 19.14 + 23.75 6.34 + 2.68 + 12.93 22.96 + 3.48 + 19.99
Overall 1321 15.59 + 2.37 + 1.54 + 4.55 18.87 + 2.76 + 19.18 + 23.21 6.03 + 2.65 + 12.11 21.71 + 4.10 + 17.73
  1. In the table, \(\Delta\)% of a method (e.g. SAP, OPUS-TASS, or SPOT-1D) is computed as \(\dfrac{\textsf {its MAE} - \textsf {SAP4SS MAE}}{\textsf {SAP4SS MAE}}*100\%\). The greater the value of \(\Delta\)MAE, the worse the performance of the method w.r.t. SAP4SS