I want to calculate importance value index for vegetation data with R function?

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Martin B. Bagaram

Check out this link

https://rdrr.io/cran/BiodiversityR/man/importancevalue.html

this second link refers to a package that allows to produce a table of constancy and importance

http://cran.r-project.org/web/packages/labdsv/labdsv.pdf

Bests

Andrew Paul McKenzie Pegman

No, but it's easy to calculate by hand. For example, if a species is found in 5 out of 8 sample points, its relative frequency is 62.5%