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Table 4

SPI and SDI correlation coefficient in monthly time scales

 SVD
PCA
SPI3SPI6SPI9SPI12SPI24SPI3SPI6SPI9SPI12SPI24
SDI3 0.562 0.719 0.776* 0.759 0.627 0.549 0.710 0.769* 0.751 0.615 
SDI6 0.388 0.682 0.792 0.805* 0.672 0.376 0.672 0.785 0.796* 0.659 
SDI9 0.303 0.521 0.738 0.828* 0.707 0.293 0.512 0.732 0.821* 0.695 
SDI12 0.211 0.397 0.572 0.771* 0.753 0.200 0.387 0.565 0.762* 0.739 
SDI24 0.130 0.225 0.316 0.423 0.801* 0.118 0.213 0.307 0.411 0.784* 
 Average
ICA
SDI3 0.525 0.696 0.750* 0.720 0.564 0.416 0.316 0.480 0.467 0.227 
SDI6 0.349 0.656 0.762 0.763* 0.604 0.280 0.278 0.491 0.495 0.239 
SDI9 0.280 0.499 0.711 0.790* 0.647 0.208 0.197 0.462 0.483 0.210 
SDI12 0.199 0.376 0.544 0.727* 0.684 0.124 0.139 0.340 0.459 0.227 
SDI24 0.124 0.199 0.286 0.380 0.716* 0.062 0.024 0.139 0.308 0.249 
 SVD
PCA
SPI3SPI6SPI9SPI12SPI24SPI3SPI6SPI9SPI12SPI24
SDI3 0.562 0.719 0.776* 0.759 0.627 0.549 0.710 0.769* 0.751 0.615 
SDI6 0.388 0.682 0.792 0.805* 0.672 0.376 0.672 0.785 0.796* 0.659 
SDI9 0.303 0.521 0.738 0.828* 0.707 0.293 0.512 0.732 0.821* 0.695 
SDI12 0.211 0.397 0.572 0.771* 0.753 0.200 0.387 0.565 0.762* 0.739 
SDI24 0.130 0.225 0.316 0.423 0.801* 0.118 0.213 0.307 0.411 0.784* 
 Average
ICA
SDI3 0.525 0.696 0.750* 0.720 0.564 0.416 0.316 0.480 0.467 0.227 
SDI6 0.349 0.656 0.762 0.763* 0.604 0.280 0.278 0.491 0.495 0.239 
SDI9 0.280 0.499 0.711 0.790* 0.647 0.208 0.197 0.462 0.483 0.210 
SDI12 0.199 0.376 0.544 0.727* 0.684 0.124 0.139 0.340 0.459 0.227 
SDI24 0.124 0.199 0.286 0.380 0.716* 0.062 0.024 0.139 0.308 0.249 

*Data with high correlation coefficients.

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