These are a subset of the tree measurement data from the Upper Flat Creek unit of the University of Idaho Experimental Forest, which was measured in 1991.
A data frame with 336 observations on the following 5 variables.
species kbd with levels DF, GF, WC, WL
tree diameter at 1.37 m. from the ground, measured in centimetres.
tree height measured in metres
The inventory was based on variable radius plots with 6.43 sq. m. per ha. BAF (Basal Area Factor). The forest stand was 121.5 ha. This version of the data omits errors, trees with missing heights, and uncommon species. The four species are Douglas-fir, grand fir, western red cedar, and western larch.
The data are provided courtesy of Harold Osborne and Ross Appelgren of the University of Idaho Experimental Forest.
Jones, O.D., R. Maillardet, and A.P. Robinson. 2009. An Introduction to Scientific Programming and Simulation, Using R. Chapman And Hall/CRC.
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