ALGORITHM 1: THREE-POINT RATIONAL FUNCTION INTERPOLATION FOR CALIBRATING GRAVITY MODELS

The purpose of this subroutine is to calibrate singly or doubly constrained gravity models by adjusting the impedance parameter beta using a three-point rational function to ensure that the observed and model mean trip costs are within a prespecified level of accuracy. The procedure adopted is outlined with a brief discussion of the underlying theory. /TRRL/

  • Corporate Authors:

    Pion Limited

    207 Brondesburg Park
    London NW2 5JN,   England 
  • Authors:
    • WILLIAMS, I N
  • Publication Date: 1977-2

Media Info

  • Features: References;
  • Pagination: p. 215-221
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00157486
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Dec 8 1977 12:00AM