adjWeibull: Adjust (fit) three-parameter Weibull distribution

In dendrometry: Forest Estimations and Dendrometric Computations

Adjust (fit) three-parameter Weibull distribution

Description

Adjust (fit) three-parameter Weibull distribution

Usage

adjWeibull(x, amplitude = 10, shape = 2, plot = TRUE, main = NULL,
title.col = "black", mid = TRUE, line.col = "blue", legendPos = "topright",
lowLim = NULL, ymax = NULL, bg = "aliceblue", method = "mps", cex.axis = 0.6,
cex.lab = 0.8, las = 1, xlab = "Diameter class (cm)",
ylab = "Relative frequency (%)", ...)

Arguments

x	numeric, vector of observations.
amplitude	numeric, amplitude of classes.
shape	numeric, optional initial values of shape for starting the iterative procedures such as Newton-Raphson.
plot	logical. Should plot?
main	character, overall title for the plot.
title.col, line.col	the color to be used for the overall title and the plot line plot respectively. Default are "blue" and "black".
mid	logical. Should the line stop at the first and last classes middle?
legendPos	character, keyword which is accepted by xy.coords. To be used to position the legend. Default is "topright".
lowLim, ymax	numeric, xlim and ylim lowest values.
bg	the color to be used for the background of the legend box.
method	used method for estimating the three-parameter Weibull distribution. See fitWeibull for details.
cex.axis, cex.lab, las	graphical parameters. See par.
xlab, ylab	title for the x and y axis.
...	additional arguments to pass through plot.

Examples

set.seed(2)
d <- rweibull(85, shape = 1, scale = 30) + 5
res <- adjWeibull(d,
  amplitude = 10, mid = FALSE, shape = 3, ymax = 30,
  main = "Weibull adjustment", line.col = "red", legendPos = "right",
  method = "mps"
)
res

dendrometry documentation built on June 8, 2025, 10:38 a.m.