blowdown: Blowdown data

In alr4: Data to Accompany Applied Linear Regression 4th Edition

Description

Data from the Boundary Waters Canoe Area Wilderness Blowdown. The data frame blowdown includes nine species of trees. The data for balsam fir, summarized by diameter class, are given in BlowBF.

Format

This data frame contains the following columns:

d

Tree diameter, in cm

s

Proportion of basal area killed for the four species balsam fir, cedar, paper birch and blue spruse, a measure of local severity of the storm.

spp

Tree species, a factor with 9 levels

y

1 if the tree died, 0 if it survived

Source

Roy Rich

References

S. Weisberg (2014). Applied Linear Regression, fourth edition. New York: Wiley.

Examples

head(Blowdown)

Example output

Loading required package: car
Loading required package: carData
Loading required package: effects
lattice theme set by effectsTheme()
See ?effectsTheme for details.
   d         s y        spp
1  9 0.0217509 0 balsam fir
2 14 0.0217509 0 balsam fir
3 18 0.0217509 0 balsam fir
4 23 0.0217509 0 balsam fir
5  9 0.0217509 0 balsam fir
6 16 0.0217509 0 balsam fir

alr4 documentation built on May 2, 2019, 6:40 p.m.