From: RETRACTED ARTICLE: Forecasting algorithm of tourism service trade based on PSO-optimized hybrid RVM model
Time
X1
X2
X3
X4
X5
2018
34.50
33.32
24.67
329.23
30,077.00
2019
39.00
24.86
34.02
489.33
36,081.00
2020
41.60
28.52
55.83
404.49
48,712.00