Search results for "road safety high correlated data reliability"

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Improving Reliability of Road Safety Estimates Based on High Correlated Accident Counts

2007

Calibrating a safety performance function (SPF) with many years of accident data creates a temporal correlation that traditional model calibration procedures cannot deal with. It is well known that generalized estimating equations (GEE) models are able to incorporate trends into accident data and thus overcome difficulties in accounting for correlation; the usual application of GEEs to safety analysis uses robust (or sandwich) estimates of regression coefficients under the independence hypothesis for the working correlation matrix. This practice is justified by the robustness of the GEE procedure against misspecification of the response correlation structure. Nevertheless, with this method…

Robustness (computer science)Covariance matrixComputer scienceMechanical EngineeringLinear regressionStatisticsEconometricsroad safety high correlated data reliabilityGeneralized estimating equationIndependence (probability theory)Reliability (statistics)Civil and Structural EngineeringEmpirical Bayes methodTransportation Research Record: Journal of the Transportation Research Board

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