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:

Source

D. Edwards. Introduction to Graphical Modelling. Springer, 2000.

S. E. Fienberg. The Analysis of Cross-Classified Categorical Data. MIT Press, 1980.

T. W. Schoener (1968). The anolis lizards of Bimini: Resource partitioning in a complex fauna. Ecology, 49: 704 – 726.

Examples


## The graphical model for this data set is:
#       Height - Species - Diameter

data(lizards)
table(lizards[, c(3,2,1)])
# , , Species = Sagrei
#
#       Diameter
# Height narrow wide
#   high     86   35
#   low      32   11
#
# , , Species = Distichus
#
#       Diameter
# Height narrow wide
#   high     73   70
#   low      61   41

## Not run: 
# This data set is useful as it offers nominal values for
# the conditional mutual information and X^2 tests.

attach(lizards)
ci.test(Height, Diameter, Species, test = "mi")
#
#       mutual information (discrete)
#
# data:  Height ~ Diameter | Species
# mi = 2.0256, df = 2, p-value = 0.3632
# alternative hypothesis: true value is greater than 0
ci.test(Height, Diameter, Species, test = "x2")
#
#       Pearson's X^2
#
# data:  Height ~ Diameter | Species
# x2 = 2.0174, df = 2, p-value = 0.3647
# alternative hypothesis: true value is greater than 0
## End(Not run)


[Package bnlearn version 1.3 Index]