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Table 1

Prediction precision contrast of four methods based on COD time series at Huaihe River

ModelsMaximum relative error (%)Average relative error (%)
Wavelet-Lyapunov 14.61 4.53 
Lyapunov 17.17 6.72 
ARMA 17.01 6.39 
ANN 13.80 7.25 
ModelsMaximum relative error (%)Average relative error (%)
Wavelet-Lyapunov 14.61 4.53 
Lyapunov 17.17 6.72 
ARMA 17.01 6.39 
ANN 13.80 7.25 
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