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Table 1 List of basis functions of the MARS and their coefficients for on-board measurements

From: Multivariate adaptive regression splines models for vehicular emission prediction

Beta Basis Value
factor function  
BF0   0.249827
BF1 Max(0, SPEED-8.11) –0.000142
BF2 Max(0, SPEED-11.67) 0.000342
BF3 Max(0, SPEED-12.52) 0.000442
BF4 Max(0, SPEED-16.39) 0.0032363
BF5 Max(0, SPEED-23.89) 0.011587
BF6 Max(0, SPEED-24.17) 0.043903
BF7 Max(0.95-ACCEL, 0) –0.001307
BF8 Max(0, ACCEL-1.25) 0.007307
BF9 Max(0, ACCEL-5.85) 0.011308
BF10 Max(0, ACCEL-7.21) 0.031102
BF11 Max(0, AMBT -22.12) 0.000231
BF12 Max(0, AMBT -23.47) 0.003130
BF13 Max(0, AMBT -24.76) 0.021131
BF14 Max(0, LOAD -10.53) 0.015618
BF15 Max(0, LOAD -52.34) 0.017966
BF16 Max(0, LOAD -60.16) 0.023225
BF17 Max(0, Power -8.98) 0.014877
BF18 Max(0, Power -21.32) 0.015679