densityRegen

Computes the density per plot of tree regeneration based on counts in subplots.
Can be grouped by additional factors for nested analysis.

Computation of dendrometric and structural parameters from forest inventory data. The objective is to provide a user-friendly R package for researchers, ecologists, foresters, statisticians, loggers and other persons who deal with forest inventory data. The package includes advanced distribution fitting capabilities with multiple estimation methods (Maximum Likelihood, Maximum Product Spacing with ties correction methods following Cheng & Amin (1983), and Method of Moments) for probability distributions commonly used in forestry. Visualization tools with confidence bands using delta method and parametric bootstrap are provided for three-parameter Weibull distribution fitting to diameter data. Useful conversion of angle value from degree to radian, conversion from angle to slope (in percentage) and their reciprocals as well as principal angle determination are also included. Position and dispersion parameters usually found in forest studies are implemented. The package contains Fibonacci series, its extensions and the Golden Number computation. Useful references are Arcadius Y. J. Akossou, Soufianou Arzouma, Eloi Y. Attakpa, Noël H. Fonton and Kouami Kokou (2013) <doi:10.3390/d5010099>, W. Bonou, R. Glele Kakaï, A.E. Assogbadjo, H.N. Fonton, B. Sinsin (2009) <doi:10.1016/j.foreco.2009.05.032>, R. C. H. Cheng and N. A. K. Amin (1983) <doi:10.1111/j.2517-6161.1983.tb01268.x>, and R. C. H. Cheng and M. A. Stephens (1989) <doi:10.1093/biomet/76.2.385>.

Narcisse Yehouenou

dendrometry

Forest Estimations and Dendrometric Computations

Information and Communication Technology for you ONG (ICT4U-ONG) 

densityRegen function

<dl><dt>data</dt>
<dd>an optional data frame, list, tibble or object coercible by
<code><a href="/link/as.data.frame?package=dendrometry&version=0.0.4" data-mini-rdoc="dendrometry::as.data.frame">as.data.frame</a></code> to a data frame containing the variables whose
names are given in <code>count</code> and <code>plot</code>.</dd>
<dt>plot</dt>
<dd>an optional character, name of the variable containing the plot
identities. If <code>data</code> is missing, a vector providing the plot identities.</dd>
<dt>count</dt>
<dd>character, name of the variable containing the counts: number
of stems (individuals). If <code>data</code> is missing, a numeric vector
providing the the counts: number of stems (individuals).</dd>
<dt>nbSubPlot</dt>
<dd>numeric, number of subplots per plot.</dd>
<dt>area</dt>
<dd>numeric, area of each subplot.</dd>
<dt>...</dt>
<dd>additional factor variables for grouping (e.g., species, site, treatment)</dd></dl>

Arguments

Density of regeneration (efficient version) — densityRegen

<dl>

<dt>data</dt>
<dd>an optional data frame, list, tibble or object coercible by
<code><a href='https://rdrr.io/r/base/as.data.frame.html'>as.data.frame</a></code> to a data frame containing the variables whose
names are given in <code>count</code> and <code>plot</code>.</dd>


<dt>plot</dt>
<dd>an optional character, name of the variable containing the plot
identities. If <code>data</code> is missing, a vector providing the plot identities.</dd>


<dt>count</dt>
<dd>character, name of the variable containing the counts: number
of stems (individuals). If <code>data</code> is missing, a numeric vector
providing the the counts: number of stems (individuals).</dd>


<dt>nbSubPlot</dt>
<dd>numeric, number of subplots per plot.</dd>


<dt>area</dt>
<dd>numeric, area of each subplot.</dd>


<dt>...</dt>
<dd>additional factor variables for grouping (e.g., species, site, treatment)</dd>

</dl>

densityRegen: Density of regeneration (efficient version)

Description

Usage

Arguments