An Improved Robust Principal Component Analysis Model for Anomalies Detection of Subway Passenger Flow

Figure 6

The events information sent by tweet users.

(a) Event1: August 20, 2015, is Chinese Valentine’s Day, and many large shopping malls near Xidan station held sales activities

(b) Event2: To facilitate celebration parade for the 70th anniversary victory of the anti-Japanese war, the traffic authorities in Beijing imposed closure restriction measures on Xidan station

(c) Event3: September 6, 2015, is Sunday but exchanged with the working day because of legal exchanging holiday