AN EXAMINATION OF RESIDUAL DISTRIBUTIONS IN ORDINARY LEAST SQUARES (OLS) HOUSEHOLD-BASED TRIP GENERATION MODELS

It is shown that the residual distributions obtained from typical OLS household-based trip generation models do not comply with the assumptions inherent in the use of ordinary least-squares. In particular, heteroscedasticity is likely to occur invalidating the estimation of coefficient standard errors by OLS procedure. A typical trip generation model is examined and it is shown that the heteroscedasticity is related to a linear function of the independent variables in the model. A transformation is suggested which would appear to yield constant residual variance.(a) /TRRL/

  • Corporate Authors:

    Pergamon Press, Incorporated

    Maxwell House, Fairview Park
    Elmsford, NY  United States  10523
  • Authors:
    • White, M T
  • Publication Date: 1976-8

Media Info

  • Features: Figures; References;
  • Pagination: p. 249-254
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00149046
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Jun 17 1977 12:00AM