Sample size needed for calibrating trip distribution and behavior of the gravity model

Çelik H. M.

Journal of Transport Geography, cilt.18, sa.1, ss.183-190, 2010 (SSCI) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 18 Sayı: 1
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.jtrangeo.2009.05.013
  • Dergi Adı: Journal of Transport Geography
  • Derginin Tarandığı İndeksler: Social Sciences Citation Index (SSCI), Scopus
  • Sayfa Sayıları: ss.183-190
  • Anahtar Kelimeler: Gravity model, Istanbul, Sample size, Travel survey, Trip distribution
  • İstanbul Gelişim Üniversitesi Adresli: Hayır

Özet

Conventional calibration algorithms of trip distribution models assume that the analyst has a whole base year trip matrix. To attain a whole trip matrix, the sample size for travel surveys needed to be as large as possible. However, this could be very expensive especially in large cities. Some studies in the past showed a small sized sample would be enough to estimate functional parameters of observed trip length frequency distribution. But the performance of a gravity model with small sized samples has never been addressed. This empirical study has shown that sample sizes as small as 1000 (even smaller for quick response studies) could be as dependable as large sample surveys using a line search calibration algorithm. © 2009 Elsevier Ltd. All rights reserved.