Table 2.

Percentage of prediction points on the Clark Error Grid zones.

Clark Error Grid zone	LSTM-NN-TF-DTWa (with transfer learning) (%)	LSTM-NN-TF-ALLb (with transfer learning) (%)	LSTM-NNc (without transfer learning) (%)	ANNd (%)	KNNe regression (%)	Ridge regression (%)	Kernel ridge regression (%)	Moving average (last 3 days) (%)
A	84.12	78.17	75.81	69.31	71.12	83.03	76.9	82.01
B	15.16	21.17	23.47	29.96	26.71	16.25	23.1	17.99
C	0	0	0	0	0	0	0	0
D	0.72	0.65	0.72	0.72	2.17	0.72	0	0
E	0	0	0	0	0	0	0	0

^aLSTM-NN-TF-DTW: second transfer learning strategy.

^bLSTM-NN-TF-ALL: first transfer learning strategy.

^cLSTM-NN: without transfer learning.

^dANN: artificial neural network.

^eKNN: k-nearest neighbors.