PARAMETER ESTIMATION FOR THE CONSTRAINED GRAVITY MODEL: A COMPARISON OF SIX METHODS

Six methods of parameter estimation for the production-constrained gravity model are compared in the context of interurban consumer travel. Monte-carlo experiments reveal that the nonlinear methods (Batty and Mackie, 1972) are inferior to the linear methods (Nakanishi and Cooper, 1974) when there is specification error present, but that the latter rapidly lose their advantage as sample sizes decrease. Bias in the parameter estimates is a more serious source of error than sampling variation. (A) /TRRL/

• Corporate Authors:

  Pion Limited

  207 Brondesburg Park
  London NW2 5JN,   England 
• Authors:
  • Stetzer, F
• Publication Date: 1976

Language

• English

Media Info

• Features: References; Tables;
• Pagination: p. 673-683
• Serial:
  • Environment and Planning
  • Volume: 8 N
  • Issue Number: 6
  • Publisher: Pion Limited

Subject/Index Terms

• TRT Terms: Errors; Gravity models; Intercity transportation; Linearity; Monte Carlo method; Nonlinear systems; Statistical sampling; Travel
• Uncontrolled Terms: Interurbans; Parameters
• ITRD Terms: 6440: Error; 690: Gravity model; 388: Inter urban; 698: Journey; 6553: Sample (stat)
• Subject Areas: Data and Information Technology; Highways; Operations and Traffic Management; I71: Traffic Theory;

Filing Info

• Accession Number: 00149066
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Jun 22 1977 12:00AM