These data are forest inventory measures from the Upper Flat Creek stand of the University of Idaho Experimental Forest, dated 1991.
ufc contains all the data.
ufcwc contains only Western red cedar.
ufcgf contains only grand fir.
A data frame with the following 5 variables.
Tree within plot
a factor with levels
DF = Douglas-fir,
GF = Grand fir,
SF = Subalpine fir,
WL = Western larch,
WC = Western red cedar,
WP = White pine
Diameter 137 cm perpendicular to the bole, mm
Height of the tree, in decimeters
Weisberg, S. (2014). Applied Linear Regression, 4th edition. New York: Wiley.