Table 2.

N-grams analysis of research keywords.

No.	Unigram	Fre.	Bigram	Fre.	Trigram	Fre.
1	tourism	233	tourist_destination	65	world_wide_web	15
2	analysis	162	united_states	64	new_south_wales	9
3	industry	116	tourism_economics	57	ile_de_france	8
4	market	104	hospitality_industry	54	ville_de_paris	8
5	tourist	104	hotel_industry	51	distributed_computer_systems	5
6	social	102	rental_sector	50	santa_cruz_de	4
7	behavior	94	tourism_market	46	cruz_de_tenerife	4
8	urban	90	sharing_economy	39	human_computer_interaction	3
9	economics	89	tourism_development	38	new_york_city	3
10	development	82	tourism_management	32	decision_support_systems	3
11	economic	80	new_york	30	deep_neural_networks	3
12	sector	79	tourist_behavior	28	convolutional_neural_network	3
13	united	76	social_media	28	major_clinical_study	3
14	data	74	housing_market	25	natural_language_processing	2
15	economy	73	spatial_analysis	25	artificial_neural_network	2
16	housing	73	service_sector	24	least_squares_method	2
17	internet	72	urban_area	23	sustainable_development_goal	2
18	destination	66	consumption_behavior	21	randomized_controlled_trial	2
19	states	64	decision_making	20	data_envelopment_analysis	2
20	information	58	price_dynamics	19	channel_state_information	2
21	research	57	service_quality	16	electronic_document_exchange	2
22	sharing	56	data_mining	16	mean_square_error	2
23	service	56	empirical_analysis	16	time_series_analysis	2
24	hospitality	55	travel_behavior	16	social_media_analytics	2
25	management	54	world_wide	15	propensity_score_matching	2
26	rental	53	wide_web	15	cutting_edge_technology	2
27	hotel	51	urban_housing	15	social_sciences_computing	2
28	new	50	social_network	15	consumer_health_information	2

Note: The keywords listed in this table are the specific terms and phrases extracted from the articles selected from the Scopus database for this study.