Table 4: Basis functions and important explanatory variables for the MARS model with .

FunctionStd. dev.Cost of omissionNumber of BFVariableRelative importance (%)

10.5170.3723 100.000
20.5190.3702 99.356
30.3950.3282 85.740
40.3690.3101 79.157
50.0660.2111 15.440