Coefficients:
Array ( [0] => 82.871716446071 [1] => -2.7259573008869 [2] => 0.0092136300148807 [3] => 0.26802867188739 )
Prediction for 12,-1000,300 = 121.35520038676
Prediction for 30,-4000,500 = 98.252813303636
Prediction for 30,-4000,400 = 71.449946114897
Prediction for 60,-4000,500 = 16.47409427703
Prediction for 20,-4000,500 = 125.5123863125
Prediction for 60,-8000,1000 = 113.6339101612