idahohd: Tree height-diameter data from Idaho (USA)

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Tree height-diameter data from Idaho (USA)

Description

These data are forest inventory measures from the Upper Flat Creek stand of the University of Idaho Experimental Forest, dated 1991.

Usage

data(idahohd)

Format

Contains five variables, as follows:

plot

Plot number.

tree

Tree within plot.

spp

Tree species. A factor variable having the following levels: "DF" is Douglas-fir (Pseudotsuga menziesii), "GF" is Grand fir (Abies grandis), "SF" is Subalpine fir (Abies lasiocarpa), "WL" is Western larch (Larix occidentalis), "WC" is Western red cedar (Thuja plicata), and "WP" is White pine (Pinus strobus).

dbh

Diameter 137 cm perpendicular to the bole, cm.

toth

Height of the tree, in m.

Source

The data were assembled from the 'ufc' dataframe from the alr4 library.

References

Weisberg S. 2014. Applied Linear Regression. 4th edition. New York: Wiley.

Examples

data(idahohd)    
head(idahohd) 
plot(toth~dbh, data=idahohd)

datana documentation built on Aug. 18, 2025, 5:18 p.m.