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- W1989961882 abstract "Scatterplots of traffic speed versus flow have received considerable attention over the past decades due to their characteristic half-moon shape. Modelling data of this type is difficult as both variables are actually not a function of each other in the sense of causality, but are rather jointly generated by a third latent variable, which is a monotone function of the traffic density. We propose local principal curves (LPCs) as a tool to describe and model speed–flow data, which takes this viewpoint into account. We introduce the concept of calibration curves to determine the relationship between the latent variable (represented by the parametrisation of the principal curve) and the traffic density. We apply LPCs to a variety of speed–flow diagrams from Californian freeways, including some so far unreported patterns." @default.
- W1989961882 created "2016-06-24" @default.
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- W1989961882 date "2011-05-01" @default.
- W1989961882 modified "2023-09-24" @default.
- W1989961882 title "Using principal curves to analyse traffic patterns on freeways" @default.
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- W1989961882 doi "https://doi.org/10.1080/18128600903500110" @default.
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