Table 2

 Regression results with adjustment for AR(1) residuals

VariableTotal revenues ($million)Average revenue per machine ($/machine)
EstimateSE*p ValueEstimateSE*p Value
*Newey-West HAC standard errors.
Plaw−6.0881.9820.003−1433.92425.800.001
Time0.5400.094<0.00180.3336.140.029
Time2−0.0030.001<0.001−0.1590.2160.463
Machines0.0020.0010.182−2.7680.361<0.001
Income ($trillion)10.5461.404<0.00110957.57264.80<0.001
Winter−4.2150.765<0.001−1198.72201.53<0.001
AR(1)−0.2730.065<0.001−0.2260.0700.002
n100100
R 2 0.8070.678