Research Article

Forecasting SPEI and SPI Drought Indices Using the Integrated Artificial Neural Networks

Table 2

The medians of performance metrics for MLP architecture 3--1 on SPI forecast for sANN_TA and hANN_TA; TA shows the training error function, and the best models are marked with bold fonts.

Calibration periodValidation period
MAE MSE dMSE NS PI MAE MSE dMSE NS PI

Leaf River
3-4-1
 sANN_MSE
  sANN_tPI
 sANN_PID
 hANN_MSE
 hANN_tPI
 hANN_PID
3-6-1
 sANN_MSE
  sANN_tPI
 sANN_PID
 hANN_MSE
  hANN_tPI
 hANN_PID
3-8-1
 sANN_MSE
  sANN_tPI
 sANN_PID
 hANN_MSE
  hANN_tPI
 hANN_PID
Santa Ysabel Creek
3-4-1
 sANN_MSE
  sANN_tPI
 sANN_PID
 hANN_MSE
  hANN_tPI
 hANN_PID
3-6-1
 sANN_MSE
  sANN_tPI
 sANN_PID
 hANN_MSE
  hANN_tPI
 hANN_PID
3-8-1
 sANN_MSE
  sANN_tPI
 sANN_PID
 hANN_MSE
  hANN_tPI
 hANN_PID