I hav calculated indicator values (IndVal) in R, is it possible to calculate (at the same time) Shannon diversity Index among habitat types/groups?

How to normalise data on OPM package from R Studio ?

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Can polymer concentrations be calculated based on the number average molecular weight?

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The Shannon's index is inversely proportional to Simpson's index (1-D)?

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Andrew Paul McKenzie Pegman

The Shannon index is Σplnp from i = 1 to s, where p is the proportion (n/N) of individuals of one particular species found (n) divided by the total number of individuals found (N), ln is the natural log, Σ is the sum of the calculations, and s is the number of species. So it is easy to calculate in R :)

Matheus Baumgartner

The Indval is usually calculated for groups with a couple or many samples, while the Shannon index is calculated for a single sample. One option is to calculate a single Shannon index for each sample, then take the mean value for that a group (which is more ecologically meaningful), or to merge the samples of one group into a single sample, then calculate the Shannon index for it.

There is no function in R that does this, as far as I know. You would need some matrices modifications previous to use the already existing functions.