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Table 1 Results of two MARS analyses (with interactions or as an additive model without interactions) on three datasets: automatic speed camera, radio and warning sign

From: Speed reduction effects over distance of animal-vehicle collision countermeasures – a driving simulator study

Dataset Automatic speed camera Radio Warning sign
MARS model With interactions Additive model With interactions Additive model With interactions Additive model
Terms selected 32 of 32 26 of 26 37 of 37 24 of 24 29 of 29 25 of 25
Selected predictors 5 of 605 4 of 605 4 of 605 4 of 605 5 of 405 4 of 405
GCV 29.85 31 36.2 44.5 24.87 25.7
R2 0.61 0.6 0.68 0.61 0.7 0.69
  1. Speed data includes distances according to Fig. 2. Dependent variable: vehicle speed. Independent variables: participants, AVC countermeasure (automatic speed camera, radio, and warning sign coded as dummy variables), wildlife fence, forest/open and measure point (when the countermeasure/event was encountered). GCV = generalized cross validation of the model and summed over all responses. R2 = R-Squared of the model calculated over all responses. Bold typed GCV shows the lowest values and the chosen MARS model for each dataset