Table 3. Frequency analysis of AI policies by government type

Ranking	Central government		Eastern local government
	Keyword	TF-IDF	Keyword	TF-IDF
1	Earthquake	0.931	Region	0.839
2	Situation	0.902	Limited_Company	0.797
3	School	0.886	Smart	0.747
4	Headquarters	0.865	This_City	0.736
5	Fund	0.859	Industry	0.711
6	Member	0.825	Curriculum	0.679
7	Experimental_Zone	0.745	Academic_Society	0.678
8	Teacher	0.744	Major	0.660
9	Provision	0.720	Medical_Institution	0.656
10	Medical_Equipment	0.719	Model	0.643

Ranking	Central local government		Western local government
	Keyword	TF-IDF	Keyword	TF-IDF
1	Scientific_Technology	1.000	Pandemic	0.722
2	Norm	0.811	Project	0.656
3	Smart	0.776	Data	0.649
4	Professional	0.755	Expert	0.632
5	Enterprise	0.642	Entire_City	0.621
6	Pandemic	0.614	Norm	0.618
7	Email	0.581	Autonomous_District	0.572
8	Voice	0.491	Smart	0.554
9	Standard	0.484	Industry	0.549
10	Committee	0.454	Consultation_Hotline	0.532

AI, artificial intelligence; TF-IDF, term frequency-inverse document frequency.