I have calculated Standardized Precipitation Index values for 25 years of data. I wish to study the frequency of excess and deficit years during 25 years. Apart from the standard classification suggested by Mc Kee, some researchers use values +_0.10 or sometimes 0.5 for assessment of excess and deficit years. Could there be any explanation to this?
https://www.researchgate.net/publication/269167822_Prediction_of_precipitation_deficit_and_excess_in_Bydgoszcz_Region_in_view_of_predicted_climate_change
http://www.scielo.br/pdf/rbmet/v26n2/01.pdf
Article Prediction of precipitation deficit and excess in Bydgoszcz ...
Yes, have more insight in info avilable on the following web link. Best..
http://drought.unl.edu/portals/0/docs/spi-program-alternative-method.pdf
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