Several measurements of 42 beech trees (Fagus Sylvatica) taken from a forest in Navarre (Spain)
A data frame with 42 observations on the following 4 variables:
diameter (diameter of the stem in centimeters)
height (height of the tree in meters)
stemweight (weight of the stem in kilograms)
aboveweight (aboveground weight in kilograms)
Gobierno de Navarra and Gestion Ambiental Viveros y Repoblaciones de Navarra, 2006. The data were obtained within the European Project FORSEE.
Ugarte, M. D., Militino, A. F., and Arnholt, A. T. 2015. Probability and Statistics with R, Second Edition. Chapman & Hall / CRC.
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pairs(BIOMASS, col = "red", cex = 0.75) plot(log(aboveweight) ~ log(diameter), data = BIOMASS) # logarithmic axes ggplot(data = BIOMASS, aes(x = diameter, y = aboveweight, color = log(stemweight))) + geom_point() + scale_x_log10() + scale_y_log10() + labs(x = "diameter of the stem in centimeters", y = "above ground weight in kilograms")
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