create_objective

Creates the objective function for optimization-based estimation methods.
For MLE, returns negative log-likelihood. For MPS, returns negative log-product-spacing
with optional ties correction.

internal

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) 

create_objective function

<dl><dt>method</dt>
<dd>character string: "mle" or "mps".</dd>
<dt>x</dt>
<dd>numeric vector of sorted data.</dd>
<dt>dist</dt>
<dd>character string specifying the distribution.</dd>
<dt>tol_spacing</dt>
<dd>numeric tolerance for spacings/densities.</dd>
<dt>ties_method</dt>
<dd>character string for ties correction.</dd>
<dt>custom_functions</dt>
<dd>list of custom distribution functions.</dd></dl>

Arguments

Create Objective Function for MPS or MLE — create_objective

<dl>

<dt>method</dt>
<dd>character string: "mle" or "mps".</dd>


<dt>x</dt>
<dd>numeric vector of sorted data.</dd>


<dt>dist</dt>
<dd>character string specifying the distribution.</dd>


<dt>tol_spacing</dt>
<dd>numeric tolerance for spacings/densities.</dd>


<dt>ties_method</dt>
<dd>character string for ties correction.</dd>


<dt>custom_functions</dt>
<dd>list of custom distribution functions.</dd>

</dl>

create_objective: Create Objective Function for MPS or MLE

Description

Usage

Value

Arguments