popn {secr} | R Documentation

## Population Object

### Description

Encapsulate the locations of a set of individual animals.

### Details

An object of class `popn` records the locations of a set of individuals, together with ancillary data such as their sex. Often used for a realisation of a spatial point process (e.g. homogeneous Poisson) with known density (intensity). Locations are stored in a data frame with columns 'x' and 'y'.

A `popn` object has attributes

covariates | data frame with numeric, factor or character variables to be used as individual covariates
model2D | 2-D distribution ('poisson', 'cluster', 'IHP')
Ndist | distribution of number of individuals ('poisson', 'fixed')
boundingbox | data frame of 4 rows, the vertices of the rectangular area

The number of rows in `covariates` must match the length of `x` and `y`. See `sim.popn` for more information on `Ndist` and `model2D`.

### Note

The `popn` class is used only occasionally: it is not central to spatially explicit capture recapture.

### Author(s)

Murray Efford murray.efford@otago.ac.nz

### See Also

`sim.popn`, `plot.popn`

[Package secr version 1.3.0 Index]