pineNAX21 | R Documentation |

The caterpillar dataset was extracted from a 1973 study on pine
processionary caterpillars. It assesses the influence of some forest
settlement characteristics on the development of caterpillar colonies. There
are k=10 potentially explanatory variables defined on n=33 areas.

The
value of x2 for the first observation was removed from the matrix of
predictors on purpose.

A data frame with 33 observations on the following 11 variables and one missing value.

- x1
altitude (in meters)

- x2
slope (en degrees)

- x3
number of pines in the area

- x4
height (in meters) of the tree sampled at the center of the area

- x5
diameter (in meters) of the tree sampled at the center of the area

- x6
index of the settlement density

- x7
orientation of the area (from 1 if southbound to 2 otherwise)

- x8
height (in meters) of the dominant tree

- x9
number of vegetation strata

- x10
mix settlement index (from 1 if not mixed to 2 if mixed)

- x11
logarithmic transform of the average number of nests of caterpillars per tree

These caterpillars got their names from their habit of moving over the
ground in incredibly long head-to-tail processions when leaving their nest
to create a new colony.

The `pineNAX21`

is a dataset with a missing
value for testing purpose.

Tomassone R., Audrain S., Lesquoy-de Turckeim E., Millier C. (1992).
“La régression, nouveaux regards sur une ancienne
méthode statistique”, INRA,
*Actualités Scientifiques et Agronomiques*, Masson,
Paris.

data(pineNAX21) str(pineNAX21)

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