Predicting Spare Parts Inventory of Hydropower Stations and Substations Based on Combined Model

Algorithm 2

Prediction of a linear autocorrelation.

 Input:

 Step1. Calculate and for ARMA ()

  for  = 0 to M % M is a positive integer

   for  = 0 to K % K is a positive integer

   end

  end

  if AIC is minimum

  output

 Step2. Forecast the time series using ARMA ().

 Step3. Get % prediction values

 Step4. % residuals

 Output: and