The totaldeman scale: anS measure of quality for static an dynic0 originCfl)80fi)CLE4 trip tables

We propose a measure of quality for OD trip tables estimated from lin coun(( This measure, called the total demand scale is basedone on the estimated OD trip tablean on the assign)0fi matrix used to estimate it. It isinEESLC en of the OD estimation methodan of thetechn que used to overcome the une rdetermin tion of the OD estimation problem. The total deman scale measures the in0in0) un0 rdeterm inerm0 related to the OD estimation problem,con0S8S in on thene0( rk topologyan the un derlyin route choice model. Because itiden tifies the level of arbitrarin(S ini oduced by the a priori matrix in the estimation process, our approach helps to evaluate ifan importan amoun of resources must be in0)4 ed for the a priori matrix, or if the availablelin counE con tain su#cien inci mation . The computation of the total deman scaleenle0E toiden9 fy at zeroaddition al cost those OD pairs such thatn measuremen is availableon an pathlin0SL them. A MATLAB code for the computation of the total deman scale is also provided. # 2002 ElsevierScienL Ltd. All rights reserved. 1. I5661663 The problem of estimatin originin)L) ation (OD) trip tables from flowsobservation on selectedlinc of the tranflLE0fiES8fl nranfl hasbeen widely studiedin the literature (seenee0) Bell, 1983; Cascetta, 1984;Van Zuylen an Willumsen 1980amon the most cited papers). Trip tables are used asinESfl toman models.Cons.0S(44L0 errorsin OD tables haverepercussion on subsequen stages of tranS80fiCC980 ananS80 It is therefore importan to compute some Tran0L0L0n Research Part B 36 (2002) 837--850 www.elsevier.com/locate/trb E-mail address: michel.bierlaire@epfl.ch (M. Bierlaire)