R: Test Whether Object is a Hybrid

is.hybrid {spatstat.core} | R Documentation

## Test Whether Object is a Hybrid

### Description

Tests where a point process model or point process interaction is a hybrid of several interactions.

### Usage

    is.hybrid(x)

    ## S3 method for class 'ppm'
    is.hybrid(x)

    ## S3 method for class 'interact'
    is.hybrid(x)

### Arguments

`x` | A point process model (object of class `"ppm"`) or a point process interaction structure (object of class `"interact"`).

### Details

A hybrid (Baddeley, Turner, Mateu and Bevan, 2012) is a point process model created by combining two or more point process models, or an interpoint interaction created by combining two or more interpoint interactions.

The function `is.hybrid` is generic, with methods for point process models (objects of class `"ppm"`) and point process interactions (objects of class `"interact"`). These functions return `TRUE` if the object `x` is a hybrid, and `FALSE` if it is not a hybrid.

Hybrids of two or more interpoint interactions are created by the function `Hybrid`. Such a hybrid interaction can then be fitted to point pattern data using `ppm`.

### Value

`TRUE` if the object is a hybrid, and `FALSE` otherwise.

### Author(s)

Adrian Baddeley Adrian.Baddeley@curtin.edu.au

and Rolf Turner r.turner@auckland.ac.nz

### References

Baddeley, A., Turner, R., Mateu, J. and Bevan, A. (2013) Hybrids of Gibbs point process models and their implementation. Journal of Statistical Software 55:11, 1–43. https://www.jstatsoft.org/v55/i11/

### See Also

`Hybrid`

### Examples

      S <- Strauss(0.1)
      is.hybrid(S)
      H <- Hybrid(Strauss(0.1), Geyer(0.2, 3))
      is.hybrid(H)

      data(redwood)
      fit <- ppm(redwood, ~1, H)
      is.hybrid(fit)

[Package spatstat.core version 2.3-0 Index]