International Gold Price Forecast Based on CEEMDAN and Support Vector Regression with Grey Wolf Algorithm

Table 2

The summary of the daily international gold price data set.

Data set	Data size	Data period	Statistical descriptions
			Mean	Variance	Range	Skewness	Kurtosis	Coefficient of variation
Full set	5950	01/03/2000–09/03/2021	1040.18	269829.34	1811.20	−0.0933	1.7389	0.4994
Training set	5655	01/03/2000–09/03/2021	1000.17	251272.09	1811.20	−0.0625	1.7461	0.5012
Test set	295	09/06/2021–21/10/2022	1807.14	6612.26	407.35	0.1811	2.7672	0.0450