TABLE 1 Coefficients and Fit of Models for Forecasting the Natural Logarithm of the Numbers of Fatal and Serious Casualties and of the Rate of Slight Casualties,,,,,,,,, ,Number of fatalities,,Number of serious casualties,,Slight casualty rates per 100 million vehicle- kilometers,,,, Parameter,Coefficient,Standard error,Coefficient,Standard error,Coefficient,Standard error,,, Autoregressive term,0.684,0.13,0.831,0.093,0.84,0.088,,, Trend,–0.027,0.002,–0.030,0.003,–0.026,0.003,,, Constant,8.996,0.043,11.534,0.065,0.205,0.054,,, Standard error,0.045,,0.042,,0.034,,,, Adjusted R2 ,0.965,,0.966,,0.966,,,,