covariates | R Documentation |
Extract or replace covariates
covariates(object, ...)
covariates(object) <- value
object |
an object of class |
value |
a dataframe of covariates |
... |
other arguments (not used) |
For replacement, the number of rows of value
must match exactly the number of rows in object
.
covariates(object) returns the dataframe of covariates associated with
object
. covariates(object)
may be NULL.
Individual covariates are stored in the ‘covariates’ attribute of a
capthist
object.
Covariates used for modelling density are stored in the ‘covariates’
attribute of a mask
object.
Detector covariates may vary between sampling occasions. In this case,
columns in the detector covariates data.frame are associated with
particular times; the matching is controlled by the
timevaryingcov
attribute.
timevaryingcov
## detector covariates
temptrap <- make.grid(nx = 6, ny = 8)
covariates (temptrap) <- data.frame(halfnhalf =
factor(rep(c("left","right"),c(24,24))) )
summary(covariates(temptrap))
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