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