An adaptive k nearest neighbour method for imputation of missing traffic data based on two similarity.

Authors

  • Yang Wang Beijing Engineering Research Centre of Urban Transport Operation Guarantee, Beijing University of Technology, Beijing Author
  • Yu Xiao Beijing Engineering Research Centre of Urban Transport Operation Guarantee, Beijing University of Technology, Beijing Author
  • Jianhui Lai Beijing Engineering Research Centre of Urban Transport Operation Guarantee, Beijing University of Technology, Beijing Author
  • Yanyan Chen Beijing Key Laboratory of Traffic Engineering, Beijing University of Technology, Beijing Author

DOI:

https://doi.org/10.5604/01.3001.0014.2968

Keywords:

missing traffic data, similarity metrics, K-nearest neighbour method, stochastic characteristics

Abstract

Traffic flow is one of the fundamental parameters for traffic analysis and planning. With the rapid development of intelligent transportation systems, a large number of various detectors have been deployed in urban roads and, consequently, huge amount of data relating to the traffic flow are accumulatively available now. However, the traffic flow data detected through various detectors are often degraded due to the presence of a number of missing data, which can even lead to erroneous analysis and decision if no appropriate process is carried out. To remedy this issue, great research efforts have been made and subsequently various imputation techniques have been successively proposed in recent years, among which the k nearest neighbour algorithm (kNN) has received a great popularity as it is easy to implement and impute the missing data effectively. In the work presented in this paper, we firstly analyse the stochastic effect of traffic flow, to which the suffering of the kNN algorithm can be attributed. This motivates us to make an improvement, while eliminating the requirement to predefine parameters. Such a parameter-free algorithm has been realized by introducing a new similarity metric which is combined with the conventional metric so as to avoid the parameter setting, which is often determined with the requirement of adequate domain knowledge. Unlike the conventional version of the kNN algorithm, the proposed algorithm employs the multivariate linear regression model to estimate the weights for the final output, based on a set of data, which is smoothed by a Wavelet technique. A series of experiments have been performed, based on a set of traffic flow data reported from serval different countries, to examine the adaptive determination of parameters and the smoothing effect. Additional experiments have been conducted to evaluate the competent performance for the proposed algorithm by comparing to a number of widely-used imputing algorithms.

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Published

2020-06-30 — Updated on 2024-02-06

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How to Cite

Wang, Y., Xiao, Y., Lai, J., & Chen, Y. (2024). An adaptive k nearest neighbour method for imputation of missing traffic data based on two similarity. Archives of Transport, 54(2), 59-73. https://doi.org/10.5604/01.3001.0014.2968 (Original work published 2024)

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