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Standardized Precipitation Index (SPI) equation using ArcGIS

Question asked by bennyistanto on Dec 5, 2019
Latest reply on Dec 5, 2019 by bennyistanto

Hello,

I usually calculate monthly or 3-monthly Standardized Precipitation Index (SPI) using spreadsheet, based on daily rainfall from weather station. Attached is the spreadsheet example.

And now I would like to use satellite precipitation estimate (raster data) to calculate the SPI. The problem is in the spreadsheet I use some function like: FREQUENCY, GAMA.DIST, NORMSINV. 

 

My question, is there any similar above function in ArcGIS? If not, I am open to any suggestion.

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