Statistical determination of diagnostic species for site groups of unequal size

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F06%3A00016126" target="_blank" >RIV/00216224:14310/06:00016126 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Statistical determination of diagnostic species for site groups of unequal size
Original language description
Aim: Concentration of species occurrences in groups of classified sites can be quantified with statistical measures of fidelity, which can be used for the determination of diagnostic species. However, for most available measures fidelity depends on the number of sites within individual groups. As the classified data sets typically contain site groups of unequal size, such measures do not enable a comparison of numerical fidelity values of species between different site groups. We therefore propose a newmethod of measuring fidelity with presence/absence data after equalization of the size of the site groups. We compare the properties of this new method with other measures of statistical fidelity, in particular with the Dufr?ne-Legendre Indicator Value(IndVal) index. Methods: The size of site groups in the data set is equalized, while relative frequencies of species occurrence within and outside of these groups are kept constant. Then fidelity is calculated using the phi coefficient of
Czech name
Statistické stanovení diagnostických druhů pro skupiny lokalit o nestejné velikosti
Czech description
Byla vypracována metoda pro stanovení diagnostických druhů v a priori daných skupinách lokalit, které se liší svojí velikostí.

Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
EH - Ecology - communities
OECD FORD branch
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Project
<a href="/en/project/GA206%2F05%2F0020" target="_blank" >GA206/05/0020: Vegetation of the Czech Republic: formalized typology, monograph and expert system</a><br>
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2006
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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