A Hybrid Approach Integrating Multiple ICEEMDANs, WOA, and RVFL Networks for Economic and Financial Time Series Forecasting

Table 1

Samples of economic and financial time series.

Dataset	Type	Dataset	Size	Date
WTI	Daily	Sample set	8641	2 January 1986∼15 April 2020
		Training set	6912	2 January 1986∼24 May 2013
		Testing set	1729	28 May 2013∼15 April 2020
USD/EUR	Daily	Sample set	5341	4 January 1999∼10 April 2020
		Training set	4272	4 January 1999∼30 December 2015
		Testing set	1069	31 December 2015∼10 April 2020
IP	Monthly	Sample set	1215	January 1919∼Match 2020
		Training set	972	January 1919∼December 1999
		Testing set	243	January 2000∼Match 2020
SSEC	Daily	Sample set	7172	19 December 1990∼21 April 2020
		Training set	5737	19 December 1990∼4 June 2014
		Testing set	1435	5 June 2014∼21 April 2020