Skip Top Navigation

Research Reports

A Forecasting Model for Grain Transportation Planning in Washington State

Description:

This project developed a demand-based forecasting model for rural and highway road transportation planning to assist decision-makers in predicting transportation demand flows of wheat in the Pacific Northwest. In order to be sensitive to policy changes, the model is based upon the disaggregate, individual shipment decisions of wheat elevators. The research found that the mode/market selection process significantly affects the usual regression estimates of mode/market demand flows. Therefore, estimates of the parameters on the major determinants of transportation demand were obtained by weighted least squares that were corrected for selectivity bias. Procedure was developed to aggregate the disaggregate predictions into total regional flows. This procedure retains the policy-sensitivity of the disaggregate model and is computationally practical in applications. Finally, the aggregate forecasting model was developed into an interactive computer program which can be used in a variety of policy-relation applications.

 

  • Date Published: April, 1987
  • Publication Number: WA-RD 183.1
  • Last Modified: September 14, 2007
  • Authors: Nancy E. Wallace, Frederick S. Inaba.
  • Originator: Washington State University.
  • # of Pages: 91 p., 1,572 KB (PDF)
  • Subject: Aggregates, Computers, Demand, Disaggregate analysis, Forecasting, Grain, Grain elevators, Mathematical models, Needs assessment, Planning, Regional transportation, Transportation, Transportation planning.
  • Keywords: Grain, transportation, demand forecasting.
  • Related Publications:


This abstract was last modified April 29, 2008