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- 7427fb2d-43b5-478a-960d-2ff9aa398462 definition "The SPI was formulated by Tom Mckee, Nolan Doesken and John Kleist of the Colorado Climate Center in 1993. The purpose is to assign a single numeric value to the precipitation which can be compared across regions with markedly different climates. Technically, the SPI is the number of standard deviations that the observed value would deviate from the long-term mean, for a normally distributed random variable. Since precipitation is not normally distributed, a transformation is first applied so that the transformed precipitation values follow a normal distribution. The Standardized Precipitation Index was designed to explicitly express the fact that it is possible to simultaneously experience wet conditions on one or more time scales, and dry conditions at other time scales, often a difficult concept to convey in simple terms to decision-makers. Consequently, a separate SPI value is calculated for a selection of time scales, covering the last 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15, 18, 24, 30, 36, 48, 60, and 72 months, and ending on the last day of the latest month." @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 id "1661580" @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 path_id 1eb0ea0a-312c-4d74-8d42-6f1ad758f999 @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 path_id 23703b6b-ee15-4512-b5b2-f441547e2edf @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 path_id 52347642-9786-4b59-be77-02e9f307118d @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 path_id 5273c8c2-d30b-4666-b2d5-0388ce2741d0 @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 path_id e9f67a66-e9fc-435c-b720-ae32a2c3d8f5 @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 path_label "ATMOSPHERIC/OCEAN INDICATORS" @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 path_label "CLIMATE INDICATORS" @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 path_label "EARTH SCIENCE" @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 path_label "PRECIPITATION INDICES" @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 path_label "Science Keywords" @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 prefLabel "STANDARDIZED PRECIPITATION INDEX" @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 reference "McKee, T.B., N.J. Doesken, and J. Kliest. 1993: The relationship of drought frequency and duration to time scales. Preprints, <i>Eighth Conference on Applied Climatology</i>, Anaheim, CA, American Meterological Society, 179-184. <P> See also the Desert Research Institute (DRI) 'http://www.wrcc.dri.edu/spi/spi.html'" @default.
- 7427fb2d-43b5-478a-960d-2ff9aa398462 tag "Science Keywords" @default.