*2.5. Pearson's Correlation Analysis*

The Pearson correlation coefficient (r) was used to detect the relationship between meteorological droughts and hydrological droughts. With the use of this coefficient, it was possible to determine the linear relationship between the SPI and SRI variables in different accumulation periods. The value of the correlation coefficient is in a closed range [−1, 1]. The greater its absolute value, the stronger the linear relationship between the variables. 0—means there is no linear relation, 1—means a positive relation, and −1—means a negative relation between the variables.
