Net Detection Probability
Compute spatially explicit net probability of detection for individual(s) at given coordinates.
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vector or 2-column matrix of coordinates
integer code for detection function q.v.
a list giving a value for each named parameter of detection function
number of sampling intervals (occasions)
integer code for discrete distribution (see
user-defined distance function or matrix (see userdist)
traps has a usage attribute then
set accordingly; otherwise it must be provided.
The probability computed is p.(X) = 1 - (1 - prod(p_s(X,k))^S where
the product is over the detectors in
traps, excluding any not
used on a particular occasion. The per-occasion detection function
p_s is halfnormal (0) by default, and is assumed not to vary
over the S occasions.
For detection functions (10) and (11) the signal threshold ‘cutval’ should be
detectpar = list(beta0 = 103, beta1
= -0.11, sdS = 2, cutval = 52.5).
The calculation is not valid for single-catch traps because p.(X) is reduced by competition between animals.
userdist cannot be set if ‘traps’ is any of polygon, polygonX,
transect or transectX. if
userdist is a function requiring
covariates or values of parameters ‘D’ or ‘noneuc’ then
have a covariates attribute with the required columns.
A vector of probabilities, one for each row in X.
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