Table 6,,,, Log of Seasonally Adjusted Passenger-Miles for Rail per Driving Age 16+ Population Equation Estimation,,,, Dependent variable: Log Rail Passenger-miles per Population Aged 16+ (seasonally adjusted),,,, Method: Least Squares,,,, Sample (adjusted): February 2000 to June 2003,,,, Included observations: 41 after adjustments,,,, Variable,Coefficient,Standard error,t-statistic,Probability Log of seasonally adjusted rail passenger miles per population aged 16+ lagged one period,0.767,0.105,7.301,0.000 Log of income per population aged 16+ ,0.175,0.079,2.223,0.032 R-squared,0.537,    ,, Adjusted R-squared,0.525,    ,, "SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics.",,,,