lizards {bnlearn} | R Documentation

## Lizards' perching behaviour data set

### Description

Real-world data set about the perching behaviour of two species of lizards in the South Bimini island, from Shoener (1968).

### Usage

    data(lizards)

### Format

The `lizards` data set contains the following variables:

- `Species` (the species of the lizard): a two-level factor with levels `Sagrei` and `Distichus`.

- `Height` (perch height): a two-level factor with levels `high` (greater than 4.75 feet) and `low` (lesser or equal to 4.75 feet).

- `Diameter` (perch diameter): a two-level factor with levels `narrow` (greater than 4 inches) and `wide` (lesser or equal to 4 inches).

### Source

Edwards DI (2000). Introduction to Graphical Modelling. Springer, 2nd edition.

Fienberg SE (1980). The Analysis of Cross-Classified Categorical Data. Springer, 2nd edition.

Schoener TW (1968). "The Anolis Lizards of Bimini: Resource Partitioning in a Complex Fauna". Ecology, 49(4):704–726.

### Examples

    # load the data.
    data(lizards)
    # create and plot the network structure.
    dag = model2network("[Species][Diameter|Species][Height|Species]")
    ## Not run: graphviz.plot(dag, shape = "ellipse")

    # This data set is useful as it offers nominal values for
    # the conditional mutual information and X^2 tests.
    ci.test("Height", "Diameter", "Species", test = "mi", data = lizards)
    ci.test("Height", "Diameter", "Species", test = "x2", data = lizards)

[Package bnlearn version 4.7.1 Index]