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Several measurements of 42 beech trees (Fagus Sylvatica) taken from a forest in Navarra (Spain).
A data frame with 42 observations on the following 4 variables:
diameter of the stem in centimeters
height of the tree in meters
weight of the stem in kilograms
aboveground weight in kilograms
Ugarte, M. D., Militino, A. F., and Arnholt, A. T. (2008) Probability and Statistics with R. Chapman & Hall/CRC.
# NOT RUN { plot(log(PSA) ~ log(Dn), data = biomass) # }
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