ON THE ESTIMATION OF TRIP MATRICES IN THE CASE OF MISSING AND UNCERTAIN DATA

The problem of missing data in the base (calibration) year is of major importance when applying the gravity model in transportation planning, because base year data are used for calibration of the model. In this article, this problem is tackled by solving an optimization problem for the prediction year for values of the entropy level and the proportions of trips in a given stratification of the cells of the trip matrix estimated in the base year. The problem of uncertain data in the prediction year is handled by replacing equality constraints for the marginal totals in the prediction year by interval constraints. Computational results are given for trip data from the Linkoeping area. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01912615
• Corporate Authors:

  Pergamon Press, Incorporated

  Headington Hill Hall
  Oxford OX30BW,    
• Authors:
  • Erlander, S
  • Joernsten, K O
  • Lundgren, J T
• Publication Date: 1985-4

Media Info

• Features: References; Tables;
• Pagination: p. 123-141
• Serial:
  • Transportation Research Part B: Methodological
  • Volume: 19
  • Issue Number: 2
  • Publisher: Elsevier
  • ISSN: 0191-2615
  • Serial URL: http://www.sciencedirect.com/science/journal/01912615

Subject/Index Terms

• TRT Terms: Calibration; Errors; Forecasting; Gravity models; Information management; Information, data, and knowledge; Matrices (Mathematics); Optimization; Planning; Transportation; Transportation planning; Travel
• Uncontrolled Terms: Optimum; Trip
• Geographic Terms: Sweden
• ITRD Terms: 6171: Calibration; 6440: Error; 132: Forecast; 690: Gravity model; 8555: Information documentation; 698: Journey; 6494: Matrix; 143: Planning; 8109: Sweden; 1155: Transport
• Subject Areas: Data and Information Technology; Planning and Forecasting; Transportation (General);

Filing Info

• Accession Number: 00451397
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: May 31 1986 12:00AM