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secr (version 2.10.2)

sighting: Sighting Attributes

Description

Extract or replace the markocc attribute of a traps object that distinguishes marking occasions from sighting occasions. Also, extract or replace the attributes Tu and Tm of a capthist object, used for storing counts of sightings. All attributes are optional, but Tu and Tm require markocc to be specified.

Usage

markocc(object, ...)
markocc(object) <- value
sighting(object)
Tu(object, ...)
Tu(object) <- value
Tm(object, ...)
Tm(object) <- value

Arguments

object
traps object (markocc) or capthist object (Tu, Tm)
value
numeric matrix of detectors x occasions, or a vector (see Details)
...
other arguments (not used)

Value

  • markocc(object) returns the markocc vector of the traps object. markocc(object) may be NULL. Tu and Tm return the respective attributes of a capthist object, or NULL if they are unspecified. sighting(object) returns TRUE if the markocc attribute indicates at least one sighting-only occasion.

Warning

** Mark-resight data formats and models are experimental in secr 2.10.0 and subject to change **

Details

For replacement of markocc, `value' should be a vector of integers indicating the occasions on which animals are sighted only (0) or marked or recaptured (1). For replacement of Tu or Tm, `value' may be a scalar (total count) or a detectors x occasions matrix.

See Also

traps, addSightings, http://www.otago.ac.nz/density/pdfs/secr-markresight.pdf{secr-markresight.pdf}