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Contents

Anthony D. Apostolides
Impacts of Productivity Changes in Air Transportation on Profits, Prices, and Labor Compensation: 1990-2001

Gary A. Davis, Sujay Davuluri, and Jianping Pei
Speed as a Risk Factor in Serious Run-off-Road Crashes: Bayesian Case-Control Analysis with Case Speed Uncertainty

Huafeng Gong, Mei Chen, Jesse Mayes, and Rob Bostrom
Speed Estimation for Air Quality Analysis

Erling Häggström Lundevaller
Measurement Errors in Poisson Regressions: A Simulation Study Based on Travel Frequency Data

Theodore Tsekeris and Antony Stathopoulos
Measuring Variability in Urban Traffic Flow by Use of Principal Component Analysis

Elke Hermans, Geert Wets, and Filip van den Bossche
Frequency and Severity of Belgian Road Traffic Accidents Studied by State-Space Methods