Instability

<p>Instability index of some freshwater fish species of the orders Amiiformes and Perciformes. The file was obtained using ModestR (Pelayo-Villamil et al., 2012; Garcia-Roselló et al., 2013).</p>

From output files obtained from the software 'ModestR', the relative contribution of factors to explain species distribution is depicted using several plots. A global geographic raster file for each environmental variable may be also obtained with the mean relative contribution, considering all species present in each raster cell, of the factor to explain species distribution. Finally, for each variable it is also possible to compare the frequencies of any variable obtained in the cells where the species is present with the frequencies of the same variable in the cells of the extent.

C�stor Gonz�lez

SPEDInstabR

Estimation of the Relative Importance of Factors Affecting
Species Distribution Based on Stability Concept

Instability function

<p>An data frame with 15 columns: taxonomic data (order, family, genus and species), variable, number of interval, value of the interval, frequencies of the cells of presence and the extent, frequencies standardized to 0-1 for both the cells of presence and the extent, instability, instability standardized to 0-1 and the contribution of the factor in percentage.</p>

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Instability: INSTABILITY INDEX AND FREQUENCIES FOR PRESENCES AND THE EXTENT

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