Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values

The use of mean value for the analysis of Ellenberg indicator values in plots or plant community types has been criticised by several authors. On the other hand, little attention has been paid to distribution patterns of the respective classes frequencies. Herewith we make a revision of metrics avai...

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Autores principales:	Alvarez,Miguel, Mõseler,Bodo Maria, San Martín,Cristina
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2013
Materias:	Bio-indicators ecological monitoring grassland vegetation species composition
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200006
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spelling	oai:scielo:S0717-664320130002000062014-05-07Tendency and distribution indices for ordinal variables applied to Ellenberg indicator valuesAlvarez,MiguelMõseler,Bodo MariaSan Martín,Cristina Bio-indicators ecological monitoring grassland vegetation species composition The use of mean value for the analysis of Ellenberg indicator values in plots or plant community types has been criticised by several authors. On the other hand, little attention has been paid to distribution patterns of the respective classes frequencies. Herewith we make a revision of metrics available for the characterization of tendency and distribution patterns of ordinal variables, like in the case of Ellenberg indicator values, and discuss their relation to frequency histogram shapes. We selected three tendencies (mean value, median value and mode) and two distribution metrics (position index and relative dominance). Additionally, we proposed a concentration index, which is analogous to the contagion index commonly used by landscape ecologists. According to our observations, we recommend the use of the median value and the concentration index to quantify respectively the tendency and distribution patterns on indicator spectra (frequency histograms) according to the Ellenberg indicator values. Further studies are required to get better ecological interpretations in the distribution patterns of indicator spectra.info:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana. Botánica v.70 n.2 20132013-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200006en10.4067/S0717-66432013000200006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Bio-indicators ecological monitoring grassland vegetation species composition
spellingShingle	Bio-indicators ecological monitoring grassland vegetation species composition Alvarez,Miguel Mõseler,Bodo Maria San Martín,Cristina Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values
description	The use of mean value for the analysis of Ellenberg indicator values in plots or plant community types has been criticised by several authors. On the other hand, little attention has been paid to distribution patterns of the respective classes frequencies. Herewith we make a revision of metrics available for the characterization of tendency and distribution patterns of ordinal variables, like in the case of Ellenberg indicator values, and discuss their relation to frequency histogram shapes. We selected three tendencies (mean value, median value and mode) and two distribution metrics (position index and relative dominance). Additionally, we proposed a concentration index, which is analogous to the contagion index commonly used by landscape ecologists. According to our observations, we recommend the use of the median value and the concentration index to quantify respectively the tendency and distribution patterns on indicator spectra (frequency histograms) according to the Ellenberg indicator values. Further studies are required to get better ecological interpretations in the distribution patterns of indicator spectra.
author	Alvarez,Miguel Mõseler,Bodo Maria San Martín,Cristina
author_facet	Alvarez,Miguel Mõseler,Bodo Maria San Martín,Cristina
author_sort	Alvarez,Miguel
title	Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values
title_short	Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values
title_full	Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values
title_fullStr	Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values
title_full_unstemmed	Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values
title_sort	tendency and distribution indices for ordinal variables applied to ellenberg indicator values
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432013000200006
work_keys_str_mv	AT alvarezmiguel tendencyanddistributionindicesforordinalvariablesappliedtoellenbergindicatorvalues AT moselerbodomaria tendencyanddistributionindicesforordinalvariablesappliedtoellenbergindicatorvalues AT sanmartincristina tendencyanddistributionindicesforordinalvariablesappliedtoellenbergindicatorvalues
_version_	1718442289344282624

Tendency and distribution indices for ordinal variables applied to Ellenberg indicator values

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