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Does the ZSI (Z-Score Index) is equal to SPI (Standardized Precipitation Index) in calculations?

The ZSI is occasionally confused with SPI. However, it is more analogous to CZI, but without the requirement for fitting precipitation data to either gamma distribution or Pearson type III distribution. In ZSI equation, we should subtract the mean monthly precipitation (mm) from precipitation in a specific month (mm) then the outcome divide to the standard deviation of any time scale (mm) (Salehnia et al., 2017).

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