A COMPARISON OF SOME CALIBRATION TECHNIQUES FOR DOUBLY CONSTRAINED MODELS WITH AN EXPONENTIAL COST FUNCTION

This paper compares the practical considerations in implementing different techniques for calibrating doubly constrained gravity type models with an exponential cost function. The comparisons are carried out under the headings of speed, accuracy, computer storage required and ease of implementation. Three techniques, due to Hyman, Evans and Hathaway, respectively, are initially considered. Various modifications and improvements to these methods are suggested and the most efficient versions of each are compared. A modified form of the method due to Hyman is found to be the fastest and most accurate for most practical situations and is recommended for general use. (A) /TRRL/

• Corporate Authors:

  Pergamon Press, Incorporated

  Maxwell House, Fairview Park
  Elmsford, NY  United States  10523
• Authors:
  • Williams, I
• Publication Date: 1976-4

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 91-104
• Serial:
  • Transportation Research /UK/
  • Volume: 10
  • Issue Number: 2
  • Publisher: Pergamon Press, Incorporated

Subject/Index Terms

• TRT Terms: Accuracy; Calibration; Computer memory; Costs; Digital computers; Exponential functions; Gravity models; Speed
• ITRD Terms: 6171: Calibration; 224: Cost; 8673: Digital computer; 690: Gravity model
• Subject Areas: Finance; Highways; Operations and Traffic Management; I71: Traffic Theory;

Filing Info

• Accession Number: 00138982
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Nov 3 1976 12:00AM