Figures & data
Figure 1 Literature survey using Google Scholar from 1986–2010 to retrieve publications in chemical ecology which transformed their proportion data as recommended by Aitchison in the fields of plant volatile (or) insect cuticular hydrocarbon analysis. The number of publications citing both the Aitchison transformation and Breiman's Random Forests is also shown.
Figure 2 Unsupervised classification of fruit-dispersal volatile organic compounds (VOCs) of three sympatric Ficus species using proportional abundance of VOCs. (A) A PCA plot of VOC proportions after transformation employing the clr (centered log ratio) method as recommended by Aitchison. (B) An MDS plot of the untransformed proportions of the same VOCs using Random Forests.
Table 1 Comparison of results from Random Forests on ripe fig fruit volatile organic compounds (VOCs) using untransformed and transformed data
