As you may know, the SPI values after calculation are obtained on a monthly basis with suitable skips in the months for corresponding time scales. What I want to know is that how should I prepare the rainfall dataset against these SPI values. For 1-month SPI values, each month in a say, 50 year time period is a data point, i.e., 50X12=600 months. So, should I prepare a time series containing monthly rainfall for each of these 600 months? And will the same time series be used for 3-month, 6-month and 12-month SPI values with a skip of repsective months?
Abhijit Mitra Thank you for answering. So essentially, the rainfall time series will remain the same for each time scale of the SPI time series? Except that in case of 3-month SPI time series, I'd have to omit the rainfall of the first 3 months of the rainfall time series, 6 months of rainfall for 6-month SPI and so on. Is this the correct approach?
İ think this is correct approach, becouse both time series represent the same period
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