N	Attributes	Attribute distribution					Importance difference (Mean as reference)
		R 1	R 2	Within	Recovering	Mean	R1	R2	Within	Recovering
1	Service	15.26%	14.89%	18.36%	17.96%	16.62%	−0.082	−0.104	0.105	0.081
2	Room	14.83%	14.90%	13.73%	14.52%	14.49%	0.023	0.028	−0.053	0.002
3	Breakfast	11.91%	12.16%	9.81%	10.69%	11.14%	0.069	0.092	−0.120	−0.041
4	Location	9.93%	9.67%	8.24%	7.32%	8.79%	0.130	0.100	−0.063	−0.167
5	Environment	7.30%	7.65%	7.69%	7.34%	7.49%	−0.026	0.021	0.026	−0.021
6	Facility	5.34%	5.09%	5.22%	5.22%	5.22%	0.023	−0.024	0.001	0.000
7	Front-desk	4.58%	5.03%	6.27%	7.47%	5.84%	−0.215	−0.138	0.074	0.279
8	Staff	5.91%	5.90%	6.64%	7.34%	6.45%	−0.084	−0.085	0.030	0.139
9	Value	3.21%	2.92%	3.12%	3.12%	3.09%	0.037	−0.055	0.008	0.010
10	Transport	2.89%	2.89%	2.74%	1.96%	2.62%	0.102	0.101	0.046	−0.250
11	Cleanliness	2.18%	2.25%	2.82%	2.80%	2.52%	−0.132	−0.105	0.123	0.114
12	Bed	2.46%	2.46%	1.65%	1.26%	1.96%	0.256	0.255	−0.157	−0.354
13	Surroundings	2.36%	2.52%	1.40%	1.49%	1.94%	0.212	0.298	−0.277	−0.233
14	Experience	2.31%	2.22%	3.06%	3.29%	2.72%	−0.151	−0.183	0.124	0.210
15	Price	2.30%	2.02%	1.94%	1.62%	1.97%	0.168	0.027	−0.018	−0.177
16	Airport	1.71%	1.79%	1.69%	0.95%	1.53%	0.115	0.165	0.101	−0.382
17	Parking	1.51%	1.36%	1.43%	1.22%	1.38%	0.095	−0.013	0.033	−0.115
18	Lobby	1.26%	1.48%	1.48%	1.42%	1.41%	−0.104	0.051	0.049	0.004
19	Restaurant	1.25%	1.22%	1.40%	1.41%	1.32%	−0.055	−0.071	0.060	0.067
20	Decor	1.50%	1.56%	1.31%	1.59%	1.49%	0.007	0.044	−0.118	0.067

Mean: average importance of an attribute across the entire dataset.

R1: importance of an attribute in Reference dataset 1 (January 21, 2019–April 13, 2019).

R2: importance of an attribute in Reference dataset 2 (April 14, 2019–June 2, 2019).

Within: importance of an attribute during COVID-19 (January 21, 2020–April 13, 2020).

Recovering: importance of an attribute in the period of recovering from COVID-19 (April 14, 2020–June 2, 2020).

Difference weight was calculated according to the formula in Section 3.3.3.