Title: Calculation of standardized precipitation index (SPI) with the use of gamma distribution

Authors: GĄSIOREK, E., MUSIAŁ, E.

Keywords: standardized precipitation index, gamma distribution, normal distribution

Abstract: In the current paper the authors have used the data from the Institute of Technology and Natural Sciences observatory in Bydgoszcz in 1946–2003 period. They have analyzed the consistency of standardized precipitation index (SPI) values, calculated with the use of two different methods. The first one extracts SPI directly from gamma distribution, with the assumption that monthly precipitation sums in 1946–2003 in Bydgoszcz are gamma distributed. The second method is based on the transformations of data leading to normal distribution. The aim of this paper was to verify the previously proposed methods on new empirical data. Out of those two methods, the direct calculation of SPI from gamma distribution is less time consuming and gives better evaluation of precipitation conditions than the method based on transformation from gamma to normal distribution.

APA style references: Gąsiorek, E. & Musiał, E. (2014). Calculation of standardized precipitation index (SPI) with the use of gamma distribution. Scientific Review Engineering and Environmental Sciences, 23 (3), 237-249.

APA style citation in text: The first time citation in text: (Gąsiorek & Musiał, 2014), next citation: (Gąsiorek & Musiał, 2014)

Chicago style references: Gąsiorek, Edward, Elżbieta Musiał. "Calculation of standardized precipitation index (SPI) with the use of gamma distribution." Scientific Review Engineering and Environmental Sciences, 65 ser., vol. 23, no 3, (2014): 237-249.

Chicago style citation in text: (Gąsiorek, and Musiał 2014)

Bibtxt style references: @article{Gąsiorek_Musiał_2014_PNIKS, author={Gąsiorek, Edward and Musiał, Elżbieta}, title={Calculation of standardized precipitation index (SPI) with the use of gamma distribution.}, journal={Scientific Review Engineering and Environmental Sciences}, URL={http://iks_pn.sggw.pl/PN65/A4/art4.pdf}, year={2014}, volume={23 (3)}, number={65}, pages={237-249}}

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