mrds: average.line – R documentation

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average.line

Average detection function line for plotting

Description

For models with covariates the detection probability for each observation can vary. This function computes an average value for a set of distances to plot an average line to graphically represent the fitted model in plots that compare histograms and the scatter of individual estimated detection probabilities. Averages are calculated over the observed covariate combinations.

Usage

average.line(finebr, obs, model)

Arguments

`finebr`	set of fine breaks in distance over which detection function values are averaged and plotted
`obs`	value of observer for averaging (1-2 individual observers; 3 duplicates; 4 pooled observation team)
`model`	ddf model object

Value

list with 2 elements

`xgrid`	vector of gridded distance values
`values`	vector of average detection function values at the `xgrid` values

Note

Internal function called from plot functions for ddf objects

Author(s)

Jeff Laake

mrds

Mark-Recapture Distance Sampling

v2.2.4

GPL (>= 2)

Authors

Jeff Laake <jeff.laake@noaa.gov>, David Borchers <dlb@st-and.ac.uk>, Len Thomas <len.thomas@st-and.ac.uk>, David Miller <dave@ninepointeightone.net> and Jon Bishop

Initial release