plot.trial: Plot fit of detection functions and histograms of data from...

In mrds: Mark-Recapture Distance Sampling

Plot fit of detection functions and histograms of data from distance sampling trial observer model

Description

Plots the fitted detection functions for a distance sampling model and histograms of the distances (for unconditional detection functions) or proportion of observations detected within distance intervals (for conditional detection functions) to compare visually the fitted model and data.

Usage

## S3 method for class 'trial'
plot(
  x,
  which = 1:2,
  breaks = NULL,
  nc = NULL,
  maintitle = "",
  showlines = TRUE,
  showpoints = TRUE,
  ylim = c(0, 1),
  angle = NULL,
  density = NULL,
  col = "lightgrey",
  jitter = NULL,
  divisions = 25,
  pages = 0,
  xlab = "Distance",
  ylab = "Detection probability",
  subtitle = TRUE,
  ...
)

Arguments

x	fitted model from ddf
which	index to specify which plots should be produced. 1 Unconditional detection function for observer 1 2 Conditional detection function plot (1|2)
breaks	user define breakpoints
nc	number of equal-width bins for histogram
maintitle	main title line for each plot
showlines	logical variable; if TRUE a line representing the average detection probability is plotted
showpoints	logical variable; if TRUE plots predicted value for each observation
ylim	range of vertical axis; defaults to (0,1)
angle	shading angle for histogram bars.
density	shading density for histogram bars.
col	colour for histogram bars.
jitter	scaling option for plotting points. Jitter is applied to points by multiplying the fitted value by a random draw from a normal distribution with mean 1 and sd jitter.
divisions	number of divisions for averaging line values; default = 25
pages	the number of pages over which to spread the plots. For example, if pages=1 then all plots will be displayed on one page. Default is 0, which prompts the user for the next plot to be displayed.
xlab	label for x-axis
ylab	label for y-axis
subtitle	if TRUE, shows plot type as sub-title
...	other graphical parameters, passed to the plotting functions (plot, hist, lines, points, etc)

Details

The structure of the histogram can be controlled by the user-defined arguments nc or breaks. The observation specific detection probabilities along with the line representing the fitted average detection probability.

It is not intended for the user to call plot.io.fi but its arguments are documented here. Instead the generic plot command should be used and it will call the appropriate function based on the class of the ddf object.

Author(s)

Jeff Laake, Jon Bishop, David Borchers

mrds documentation built on May 29, 2024, 3:56 a.m.