Beech Trees

Source: R/AgainStart.R

Several measurements of 42 beech trees (Fagus Sylvatica) taken from a forest in Navarre (Spain)

BIOMASS

Format

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)

Source

Gobierno de Navarra and Gestion Ambiental Viveros y Repoblaciones de Navarra, 2006. The data were obtained within the European Project FORSEE.

References

Ugarte, M. D., Militino, A. F., and Arnholt, A. T. 2015. Probability and Statistics with R, Second Edition. Chapman & Hall / CRC.

Examples

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")