Table 5.

Documents co-citation clusters (1999–2018).

Cluster ID	Size	Silhouette	Mean (year)	Labels
0	133	0.691	2008	Tourism demand
2	80	0.912	2002	Monthly arrivals
3	78	0.938	2011	Big data
4	72	0.964	2006	Integrative modeling
5	71	0.961	2007	Ski tourism
6	65	0.956	1996	Feed-forward
7	59	0.941	1999	Neural networks
8	58	0.926	2009	Time-series
9	57	0.984	2005	Co-integration
10	56	0.934	1999	Food
11	52	0.984	2005	Impulse response function
12	50	0.985	2003	Energy
14	43	0.968	2008	Genetic fuzzy systems
15	39	0.985	1999	Indonesia
16	39	0.97	2007	Crisis
19	33	0.991	2003	South Korea
21	30	0.983	2006	ARDL
22	30	0.994	2005	Airline industry
24	27	0.926	2004	Shock
30	19	0.986	1995	Partial models
33	17	0.999	2008	Energy efficiency
35	15	0.999	2007	Domain knowledge
37	13	0.994	2013	Multivariate singular spectrum analysis
38	13	0.999	2006	Service price
46	5	0.997	2006	Seasonal time series