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Table 3 List of basis functions of the MARS and their coefficients for dynamometer testing

From: Multivariate adaptive regression splines models for vehicular emission prediction

Beta Basis Value
factor function  
BF0   0.313578
BF1 Max(0, SPEED-6.43) –0.000172
BF2 Max(0, SPEED-9.36) 0.000625
BF3 Max(0, SPEED-18.37) 0.005751
BF4 Max(0, SPEED-25.14) 0.063521
BF5 Max(0, ACCEL-1.12) 0.009433
BF6 Max(0, ACCEL-4.24) 0.056731
BF7 Max(0, ACCEL-6.24) 0.066312
BF8 Max(0, AMBT -21.54) 0.000321
BF9 Max(0, AMBT -23.15) 0.004433
BF10 Max(0, AMBT -24.62) 0.037215
BF11 Max(0, LOAD -15.67) 0.013211
BF12 Max(0, LOAD -45.67) 0.053412
BF13 Max(0, Power -13.76) 0.016813
BF14 Max(0, Power -20.64) 0.021213