Table 2.

Word Frequency Weights in Weibo Comments.

Key Words	Frequency	tf	idf	tfidf	Key Words	Frequency	tf	idf	tfidf
Shanghai	19636	135.42	0.79	106.86	Thanks	1875	12.93	1.74	22.54
Epidemic	7781	53.66	1.15	61.97	Ask for help	1750	12.07	1.85	22.31
Come on	5027	34.67	1.36	47.30	Weibo	1711	11.80	1.79	21.17
Community	2989	20.61	1.58	32.60	Positive	1502	10.36	1.89	19.54
Nucleic acid	2941	20.28	1.60	32.44	Government	1530	10.55	1.81	19.14
Isolation	2829	19.51	1.62	31.58	Epidemic prevention	1455	10.03	1.87	18.79
Sad	2594	17.89	1.58	28.26	Shenzhen	1340	9.24	1.92	17.76
Anti-epidemic	2012	13.88	1.78	24.65	Safety	1380	9.52	1.84	17.50
Materials	2083	14.37	1.71	24.55	Bitter	1333	9.19	1.87	17.18
Shanghai residents	1930	13.31	1.76	23.49	Hospital	1259	8.68	1.96	17.03