LIZARD.DAT
Data file belonging to the GLM macro package of XploRe 3.0.
The data is from "Generalized Linear Models, 2nd Edition", McCullagh and 
Nelder (1989), Chapman and Hall, p. 129.
Data concerning the daytime habits of two species of lizard, grahami and
opalinus, were collected by observing occupied sites or perches and recording
the appropriate description, namely species involved, time of day, height and
diameter of perch and whether the site was sunny or shaded.

The first column is an index for the height of the perch (in feet):
  0  =  <5,  1 = >=5
The second column is an index for the diameter of the perch (in inch):
  0  =  <=2,  1 = >2
The third column is an index whether the site was sunny or shaded.
  0  =  Sun,  1  =  Shade
The fourth column is an index for the time of day:
  1  = Early,  2 = Mid-day,  3 = Late
The fifth column gives the number of grahami observed.
The sixth column gives the total number of lizards observed.