secr (version 3.0.1)

covariates: Covariates Attribute

Description

Extract or replace covariates

Usage

covariates(object, ...)
covariates(object) <- value

Arguments

object

an object of class traps, popn, capthist, or mask

value

a dataframe of covariates

…

other arguments (not used)

Value

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.

Details

For replacement, the number of rows of value must match exactly the number of rows in object.

See Also

timevaryingcov

Examples

## 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))