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Titolo: ESTIMATING SAMPLESIZE FOR INFERENCE ABOUT THE SHANNONWEAVER AND THESIMPSON INDEXES OF SPECIESDIVERSITY
Autore: MAGNUSSEN S; BOYLE TJB;
 Indirizzi:
 CANADIAN FOREST SERV CHALK RIVER ON K0J 1J0 CANADA CANADIAN FOREST SERV HULL PQ CANADA
 Titolo Testata:
 Forest ecology and management
fascicolo: 13,
volume: 78,
anno: 1995,
pagine: 71  84
 SICI:
 03781127(1995)78:13<71:ESFIAT>2.0.ZU;22
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 PATTERN; INDEXES;
 Keywords:
 PRIOR DISTRIBUTION; BETA DISTRIBUTION; SAMPLE SIZE; SPATIAL ASSOCIATION;
 Tipo documento:
 Article
 Natura:
 Periodico
 Settore Disciplinare:
 Science Citation Index Expanded
 Citazioni:
 50
 Recensione:
 Indirizzi per estratti:



 Citazione:
 S. Magnussen e T.J.B. Boyle, "ESTIMATING SAMPLESIZE FOR INFERENCE ABOUT THE SHANNONWEAVER AND THESIMPSON INDEXES OF SPECIESDIVERSITY", Forest ecology and management, 78(13), 1995, pp. 7184
Abstract
A framework for a priori estimation of the expected sampling variances of the ShannonWeaver and the Simpson indices of species diversity is developed by the introduction of the most probable relative species abundance distribution (MOPSAD). MOPSAD gives the prior probability ofa species' relative abundance. The beta distribution is used here as the prior for MOPSAD. Sample sizes needed for efficient statistical inference and hypothesis testing about the two indices are provided for 16 distinct beta priors for MOPSAD. ShannonWeaver and Simpson's diversity indices in plant communities expected to have a 'U'shaped or a Jshaped MOPSAD will have large sampling variances. For the same statistical resolution the Simpson index requires about nine times as many samples as the ShannonWeaver index. The impact of a positive or negative spatial association among species on the variance of the diversity indices was also assessed. In general, spatial association had little impact on the variance of the indices; it suffices to increase the sample size by about 5% as a safeguard against variance inflation due to spatial associations.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 00:13:25