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

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 249-254
• Serial:
  • Transportation Research /UK/
  • Volume: 10
  • Issue Number: 4
  • Publisher: Pergamon Press, Incorporated

Subject/Index Terms

• TRT Terms: Households; Least squares method; Mathematical analysis; Mathematical models; Physical distribution; Regression analysis; Residual soils; Travel; Trip generation
• Uncontrolled Terms: Models; Residual
• ITRD Terms: 6471: Analysis (math); 309: Household; 698: Journey; 6473: Mathematical model; 6588: Regression analysis; 9069: Residual
• Subject Areas: Data and Information Technology; Freight Transportation; Highways; Operations and Traffic Management; Society; I71: Traffic Theory;

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