rygg

rygg_

Rygg's index of diversity is given by
$$SN = \frac{\ln(S)}{\ln(\ln(N))}$$ 
The adjusted version of Rygg's index which gives more consistent values
for smaller <code>S=2, N=2, N=3</code> and <code>S=3, N=3</code> is
$$SN = \frac{\ln(S)}{\ln(\ln(N+1)+1)}$$

Preprocessing tools and biodiversity measures
(species abundance, species richness, population heterogeneity and
sensitivity) for analysing marine benthic data. See Van Loon et al.
(2015) <doi:10.1016/j.seares.2015.05.002> for an application of
these tools.

Dennis Walvoort

benthos

Marine Benthic Ecosystem Analysis

rygg function

<dl><dt>.data</dt>
<dd>data in a <code>data.frame</code>, <code>tibble</code>, 
<code>data.table</code>, database etc.</dd>
<dt>taxon</dt>
<dd>taxa names (<code>character</code>)</dd>
<dt>count</dt>
<dd>counts (<code>numeric</code>)</dd>
<dt>adjusted</dt>
<dd>(defaults to <code>FALSE</code>)</dd></dl>

Arguments

<ul>
<li><code>rygg_()</code>: version suitable for calling from a function
(see package lazyeval).</li>
</ul>

Functions

Rygg's Index of Diversity — rygg

<dl>

<dt>.data</dt>
<dd>data in a <code>data.frame</code>, <code>tibble</code>, 
<code>data.table</code>, database etc.</dd>


<dt>taxon</dt>
<dd>taxa names (<code>character</code>)</dd>


<dt>count</dt>
<dd>counts (<code>numeric</code>)</dd>


<dt>adjusted</dt>
<dd>(defaults to <code>FALSE</code>)</dd>

</dl>

rygg: Rygg's Index of Diversity

Description

Usage

Value

Arguments

Functions

References

Examples