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Table 2 Comparison of multiple regression (REG), backpropagation neural network (BPNN), generalized regression neural network (GRNN) and support vector machine (SVM) based prediction accuracy of rice blast severity measured as correlation coefficient (r), coefficient of determination (r2) and percent mean absolute error (%MAE) of observed value for 'cross-year' models over various locations.

From: Machine learning techniques in disease forecasting: a case study on rice blast prediction

Location(s) Year (s) Multiple Regression (REG) Artificial Neural Network (ANN) Support Vector Machine (SVM)
       BPNN GRNN    
  Training Data Test Data r r 2 %MAE r r 2 %MAE r r 2 %MAE r r 2 %MAE
L – I 2000,01,02,03 2004 0.56 0.31 56.85 0.59 0.35 56.19 0.66 0.44 50.72 0.67 0.45 46.23
  2001,02,03,04 2000 0.36 0.13 60.37 0.50 0.25 58.90 0.63 0.40 40.86 0.75 0.56 38.07
  2000,02,03,04 2001 0.69 0.48 61.68 0.71 0.50 59.73 0.72 0.52 59.17 0.78 0.61 49.06
  2000,01,03,04 2002 0.17 0.03 85.70 0.17 0.03 77.18 0.35 0.12 75.97 0.54 0.29 67.35
  2000,01,02,04 2003 0.30 0.09 65.19 0.58 0.34 53.59 0.62 0.38 52.92 0.70 0.49 39.14
L – II 2000,01,02,03 2004 0.62 0.38 92.79 0.11 0.01 72.18 0.49 0.24 70.58 0.66 0.44 43.52
  2001,02,03,04 2000 0.58 0.34 45.04 0.78 0.61 44.29 0.93 0.87 40.15 0.93 0.87 25.41
  2000,02,03,04 2001 0.23 0.05 77.56 0.42 0.18 73.12 0.53 0.28 62.49 0.53 0.28 50.32
  2000,01,03,04 2002 0.48 0.23 51.76 0.56 0.32 48.09 0.76 0.58 41.03 0.79 0.62 40.13
  2000,01,02,04 2003 -0.10 0.01 99.31 0.20 0.04 60.62 0.22 0.05 56.81 0.60 0.36 45.54
L-III 2000,01 2003 0.50 0.25 52.72 0.68 0.46 36.30 0.82 0.67 29.97 0.84 0.71 20.27
  2001,03 2000 0.62 0.38 43.67 0.60 0.36 40.62 0.83 0.69 33.38 0.86 0.74 22.18
  2000,03 2001 0.14 0.02 71.93 0.58 0.34 38.30 0.63 0.40 35.93 0.65 0.42 35.10
L-IV 2000,01,02,03 2004 0.66 0.44 56.99 0.62 0.38 51.72 0.78 0.61 49.62 0.84 0.71 47.49
  2001,02,03,04 2000 0.55 0.30 53.03 0.68 0.46 45.99 0.72 0.52 43.31 0.77 0.59 41.90
  2000,02,03,04 2001 0.89 0.79 68.55 0.89 0.79 65.23 0.90 0.81 30.75 0.97 0.94 29.90
  2000,01,03,04 2002 0.84 0.71 91.18 0.90 0.81 23.93 0.94 0.88 20.95 0.96 0.92 14.79
  2000,01,02,04 2003 0.48 0.23 71.71 0.56 0.31 67.39 0.58 0.34 62.60 0.66 0.44 40.39
L-V 2000,01,02,03 2004 0.38 0.14 78.13 0.64 0.41 62.55 0.66 0.44 56.82 0.80 0.64 50.22
  2001,02,03,04 2000 0.67 0.45 55.71 0.71 0.51 38.99 0.73 0.53 32.09 0.98 0.96 15.23
  2000,02,03,04 2001 0.78 0.61 72.13 0.83 0.69 52.07 0.90 0.81 50.56 0.93 0.87 21.18
  2000,01,03,04 2002 0.53 0.28 56.44 0.86 0.74 51.91 0.87 0.76 46.30 0.87 0.76 35.28
  2000,01,02,04 2003 0.61 0.37 54.91 0.61 0.37 50.26 0.62 0.38 48.17 0.65 0.42 46.17
  1. where,
  2. L – I = Location-I viz. Palampur (1st date of transplanting; 15 days prior to normal transplanting)
  3. L – II = Location-II viz. Palampur (2nd date of transplanting; normal time of transplanting)
  4. L – III = Location-III viz. Palampur (3rd date of transplanting; 15 days after the normal transplanting)
  5. L – IV = Location-IV viz. Rice Research Station, Malan (CSK HPAU)
  6. L – V = Location-V viz. Farmers' fields, Pharer.