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How can I calculate standard precipitation index (SPI)?

The Standardized Precipitation Index (SPI) is a widely used index to characterize meteorological drought on a range of timescales. On short timescales, the SPI is closely related to soil moisture, while at longer timescales, the SPI can be related to groundwater and reservoir storage. Standard precipitation index formula is very simple but due to precipitation data follow gamma distribution, you should to use gamma distribution. Gamma distribution is difficult but you can use MDM, RDIT, or DMAP for calculating standard precipitation index (SPI), these softwares is very simple and user-friendly.

Name: Jaffar Mirzadeh