Computational and Mathematical Methods in Medicine Prediction of COVID-19 in BRICS Countries: An Integrated Deep Learning Model of CEEMDAN-R-ILSTM-Elman

Table 1

Complexity and periodic analysis of IMFs in South Africa.

Mode	PE value	Complexity	Main timescale
IMF1	0.9943	High level	3.209
IMF2	0.9227	High level	4.872
IMF3	0.8750	High level	5.901
IMF4	0.8081	High level	7.661
IMF5	0.6193	Medium level	18.635
IMF6	0.4656	Low level	73.512
IMF7	0.4326	Low level	118.750
IMF8	0.4123	Low level	197.917
IMF9	0.4014	Low level	475
Residue	0.1032	Trend level	>sample size