Missing data imputation for transfer passenger flow identified from in-station WiFi systems. Issue 1 (31st December 2023)

• Record Type: Journal Article
• Authors: Jiang, Wenhua; Zheng, Nan; Kim, Inhi
• Is Part Of: Transportmetrica. Volume 11:Issue 1(2023)
• Page Start: 325
• Page End: 342
• Publication Date: 2023-12-31
• Subjects: WiFi data -- missing data -- transfer flow -- multitask Gaussian process; Transportation -- Mathematical models -- Periodicals; 388.015118
• DOI: 10.1080/21680566.2022.2064935
• Languages: English
• ISSNs: 2168-0566

Abstract

Abstract : This paper presents a new perspective for in-station transfer flow estimation, utilising data collected by WiFi sensor system, which is critical for path choice modelling and pedestrian management. The full in-station transfer flow can be estimated by scaling up a 'seed matrix', which is constructed based on the identification of inter-platform transfer activities. Due to sensor failures, the main problem comes from handling the missing elements in the constructed 'seed matrix'. We address this problem with a novel kernel-based framework, named self-measuring multi-task Gaussian process (SM-MTGP). The heterogeneous correlations in temporal features are captured by the designed task-based and input-based kernels separately. Moreover, a self-measuring kernel is designed for learning the correlations carried by the observations. The performance of the proposed method is validated with data from a busy railway station. The results show that the proposed algorithm achieves the best imputation accuracy in both accuracy and robustness, especially at high missing rates.