Correlation Analysis of External Environment Risk Factors for High-Speed Railway Derailment Based on Unstructured Data

Table 2

Sample data set of Apriori algorithm.

No.	Key words
1	Error	Violation	Conflict	Class D accident
2	Violation	Discipline	Derailment	Class D accident
3	Violation	Collision	Class D accident
4	Error	Violation	Train delay	Class D accident
5	Violation	Dispatch command	Train delay	Class D accident
6	Equipment	Control	Error	Train delay	Class D accident
7	Vehicle	Construction machinery	Train delay	Class D accident
8	Error	Loading and unloading	Train delay	Class D accident
9	Equipment	Fault	Train delay	Class D accident