ShannonWiener index of diversity
ShannonWiener index of diversity(information index) A measure derived from information theories developed by Claude E. Shannon and Norbert Wiener and published in 1949 by Shannon and Warren Weaver, which is used by ecologists when a system contains too many individuals for each to be identified and examined. A small sample is used; the index (D) is the ratio of the number of species to their importance values (e.g. biomass or productivity) within a trophic level or community. D = − Σ^{s}_{i}p_{i}logp_{i}, where s is the total number of species in the sample, i is the total number of individuals in one species, p_{i} (a decimal fraction) is the number of individuals of one species in relation to the number of individuals in the population, and the log is to base2 or basee.
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"ShannonWiener index of diversity." A Dictionary of Ecology. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.
"ShannonWiener index of diversity." A Dictionary of Ecology. . Encyclopedia.com. (December 11, 2017). http://www.encyclopedia.com/science/dictionariesthesaurusespicturesandpressreleases/shannonwienerindexdiversity
"ShannonWiener index of diversity." A Dictionary of Ecology. . Retrieved December 11, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionariesthesaurusespicturesandpressreleases/shannonwienerindexdiversity
Shannon–Wiener index of diversity
Shannon–Wiener index of diversity (information index) A measure used by ecologists when a system contains too many individuals for each to be identified and examined. A small sample is used; the index (D) is the ratio of the number of species to their importance values (e.g. biomass or productivity) within a trophic level or community. D = −Σ^{s}_{i}p_{i} log p_{i}, where s is the total number of species in the sample, i is the total number of individuals in one species, p_{i}, (a decimal fraction) is the number of individuals of one species in relation to the number of individuals in the population, and the log is to base2 or basee.
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"Shannon–Wiener index of diversity." A Dictionary of Zoology. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.
"Shannon–Wiener index of diversity." A Dictionary of Zoology. . Encyclopedia.com. (December 11, 2017). http://www.encyclopedia.com/science/dictionariesthesaurusespicturesandpressreleases/shannonwienerindexdiversity1
"Shannon–Wiener index of diversity." A Dictionary of Zoology. . Retrieved December 11, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionariesthesaurusespicturesandpressreleases/shannonwienerindexdiversity1
ShannonWiener index of diversity
ShannonWiener index of diversity (ShannonWeaver index, information index) A measure, derived from information theories developed by Claude E. Shannon and Norbert Wiener and published in 1949 by Shannon and Warren Weaver, that is used by ecologists when a system contains too many individuals for each to be identified and examined. A small sample is used; the index is the ratio of the number of species to their importance values (e.g. biomass or productivity) within a trophic level or community.
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"ShannonWiener index of diversity." A Dictionary of Plant Sciences. . Encyclopedia.com. 11 Dec. 2017 <http://www.encyclopedia.com>.
"ShannonWiener index of diversity." A Dictionary of Plant Sciences. . Encyclopedia.com. (December 11, 2017). http://www.encyclopedia.com/science/dictionariesthesaurusespicturesandpressreleases/shannonwienerindexdiversity0
"ShannonWiener index of diversity." A Dictionary of Plant Sciences. . Retrieved December 11, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionariesthesaurusespicturesandpressreleases/shannonwienerindexdiversity0