Assessment of Accuracy of Precipitation Index (spi) Determi-ned by Different Probability Distributions
Year: 2014
Type: article
Abstract: The use of different calculating methods to compute the standardized precipitation index (SPI) results in various approximations. Methods based on normal distribution and its transformations, as well as on gamma distribution, give similar results and may be used equally, whereas the lognormal distribution fitting method is significantly discrepant, especially for extreme values of SPI. Therefore, it is problematic which method gives the distribution optimally fitted to empirical data. The aim of this study is to categorize the above mentioned methods according to the degree of approximation to empirical data from the Observatory of Agro- and Hydrometeorology in Wrocław-Swojec from 1964–2009 years.
DOI: 10.12912/2081139x.73
Authors: Edward Gąsiorek, Elżbieta Musiał, Marian Rojek
Language: English
Subfield: Global and Planetary Change
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W889794744