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Table 2 List of basis functions of the B-MARS and their coefficients for on-board measurements

From: Multivariate adaptive regression splines models for vehicular emission prediction

Beta Basis Value
factor function  
BF0   0.218753
BF1 Max(0, SPEED-9.22) –0.000112
BF2 Max(0, SPEED-12.54) –0.000212
BF3 Max(0, SPEED-14.23) 0.000211
BF4 Max(0, SPEED-17.16) 0.002417
BF5 Max(0, SPEED-24.32) 0.011213
BF6 Max(0.98-ACCEL, 1.12) –0.001126
BF7 Max(0, ACCEL-2.61) –0.004267
BF8 Max(0, ACCEL-6.92) 0.011211
BF9 Max(0, ACCEL-7.56) 0.024123
BF10 Max(0, AMBT -22.51) 0.000212
BF11 Max(0, AMBT -23.78) 0.003451
BF12 Max(0, LOAD -13.15) 0.013617
BF13 Max(0, LOAD -54.56) 0.016541
BF14 Max(0, POWER -7.34) 0.012346
BF15 Max(0, POWER -9.76) 0.013145
BF16 Max(0, POWER -22.17) 0.012678