covariates {secr}

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)

Details

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

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.

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))