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Statistical Cost Studies for Railways
E The Development of Econometric Analysis
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applied assumptions average Borts Box-Cox Canadian Caves Christensen CLASS I railways Class II railroads coefficients Company Code correlation cost categories cost elasticities cost estimates covariance matrix cross section density diagonal disaggregate cost distributed lag disturbances econometric techniques Economics economies of scale efficient expenditures explanatory variables firms formulation Freight Car Freight Gross functional form gross ton miles GTMs included independent variables length of haul likelihood function likelihood ratio statistic linear form Locomotive mathematical form miles of track multicollinearity null hypothesis OLS estimates ordinary least squares output measures parameter estimates passenger production function rail cost functions railway costing random regression regression analysis regression fallacy relationship run cost function sample significant specific track maintenance costs traffic Trainmen Expenses translog function Transportation U.S. Railroads U.S. railways University of Wisconsin-Madison variance