00176461

Component

http://onlinepubs.trb.org...s/trr/1977/637/637-011.pdf

https://scholar.google.co...tone&publication_year=1977

The use of a freight transportation service at two levels of geographic aggregation, represented by nonoverlapping component traffic flows and the aggregate that combines them, is modeled. The basic aim is estimators of demand parameters. Propensity is used to denote the nonrandom part of the actual percentage of goods shipped via the specified service. The general approach is by three hypotheses: The first states that the expected value of use in the aggregate is a weighted average of expected use in the components. The second states that the expected use in each component equals expected aggregate use plus a constant. The third states that all of the random variables describing service use have the same form whether aggregate or component. An illustrative study of rail shipments by manufacturers using four component traffic flows is included. It is noted that greater commodity detail and the inclusion of at least a relative price are required for a conclusive empirical study.

Publication of this paper sponsored by Committee on Passenger and Freight Transportation Characteristics. 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

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1977

Transportation Research Record

0309026644

Print

Commodities; Economics; Freight traffic; Freight transportation; Information processing; Mathematical models; Network analysis (Planning); Origin and destination; Railroad transportation; Soil compaction test; Statistical analysis; Statistics; Transportation

Models; Proctor compaction test

Data and Information Technology; Economics; Society; Transportation (General)

TRIS, TRB

Jun 14 1978 12:00AM

• ADAPTABLE-ZONE TRANSPORTATION-ASSIGNMENT PACKAGE
• AN APPLICATION OF DIAGNOSTIC TESTS FOR THE INDEPENDENCE FROM IRRELEVANT ALTERNATIVES PROPERTY OF THE MULTINOMIAL LOGIT MODEL
• ANALYSIS AND PREDICTION OF NONWORK TRAVEL PATTERNS OF THE ELDERLY AND HANDICAPPED
• ANALYSIS OF PREDICTIVE QUALITIES OF DISAGGREGATE MODAL-CHOICE MODELS
• ANALYSIS OF TRUCK DELIVERIES IN A SMALL BUSINESS DISTRICT
• APPROACH TO MEASUREMENT OF MODAL ADVANTAGE
• APPROXIMATION EQUATIONS FOR COSTS OF RAIL, TRAILER-ON-FLATCAR, AND TRUCK INTERCITY FREIGHT SYSTEMS
• CHOICE-MODEL PREDICTIONS OF CAR-POOL DEMAND: METHODS AND RESULTS
• EFFECTS OF PARKING COSTS ON URBAN TRANSPORT MODAL CHOICE
• EFFECTS OF SMALL SAMPLE ORIGIN-DESTINATION DATA ON TRANSPORTATION STUDY RESULTS
• EVALUATION OF POTENTIAL POLICIES FOR INTERCITY PASSENGER TRANSPORTATION IN CANADA (ABRIDGMENT)
• POLICY-CONTINGENT TRAVEL FORECASTING WITH MARKET SEGMENTATION
• PRIORITY LANES ON URBAN RADIAL FREEWAYS: AN ECONOMIC-SIMULATION MODEL
• RIDE SHARING TO WORK: AN ATTITUDINAL ANALYSIS