Table 6: Basis functions and important explanatory variables for the MARS model with .

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

10.5400.3521 100.000
20.5350.3442 97.416
30.3890.3061 83.637
40.3800.2941 78.935
50.1740.2172 35.183
60.1670.2162 33.487
70.1490.2121 29.230
80.1430.2111 29.042