covariates {secr} | R Documentation

## 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.

### Author(s)

Murray Efford murray.efford@otago.ac.nz

### Examples

    temptrap <- make.grid(nx = 6, ny = 8)
    covariates (temptrap) <- data.frame(halfnhalf =
        factor(rep(c('left','right'),c(24,24))) )
    summary(covariates(temptrap))

[Package secr version 1.3.0 Index]