NONRESPONSE BIAS AND TRIP GENERATION MODELS

There is serious concern over the fact that travel surveys often overrepresent smaller households with higher incomes and better education levels and, in general, that nonresponse is nonrandom. However, when the data are used to build linear models, such as trip generation models, and the model is correctly specified, estimates of parameters are unbiased regardless of the nature of the respondents, and the issues of how response rates and nonresponse bias are ameliorated. The more important task then is the complete specification of the model, without leaving out variables that have some effect on the variable to be predicted. The theoretical basis for this reasoning is given along with an example of how bias may be assessed in estimates of trip generation model parameters. Some of the methods used are quite standard, but the manner in which these and other more nonstandard methods have been systematically put together to assess bias in estimates shows that careful model building, not concern over bias in the data, becomes the key issue in developing trip generation and other models.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1993/1412/1412-009.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=NONRESPONSE+BIAS+AND+TRIP+GENERATION+MODELS&author=P.+Thakuriah&author=A.+Sen&author=S.+Soot&author=E.+Christopher&publication_year=1993
• Availability:
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• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1412, Innovations in Travel Survey Methods. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Thakuriah, Piyushimita
  • Sen, Ashish
  • Soot, Siim
  • Christopher, Edward
• Publication Date: 1993

Language

• English

Media Info

• Features: References; Tables;
• Pagination: p. 64-70
• Monograph Title: Innovations in travel survey methods
• Serial:
  • Transportation Research Record
  • Issue Number: 1412
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Statistical bias; Travel surveys; Trip generation
• Old TRIS Terms: Nonresponse bias
• Subject Areas: Highways; Planning and Forecasting; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00642385
• Record Type: Publication
• ISBN: 0309055598
• Files: TRIS, TRB, ATRI
• Created Date: Feb 17 1994 12:00AM