Fig. 1
From: Classical and Robust Regression Analysis with Compositional Data
Descriptive diagrams of the sets of variables used. Displayed are histograms of Annual Precipitation in the original (a) and logarithmic (b) scales. Boxplots of log-scaled Annual Precipitation (c) and histogram of sample sizes (d) according to climate groups follow. The climate groups are used to color sand-silt-clay compositions in the ternary diagram (e). Finally, the multivariate data structure of chemical compositions is captured using the compositional biplot (f)