Table S5: Principal Component Analysis of willow phenolic compounds

This R script replicates the principal component analyses we performed on different classes of phenolic compounds (Table S5) in the manuscript entitled, "Multiple plant traits shape the genetic basis of herbivore community assembly." We explored different transformations (sqrt, log, log(x+1)) to linearize the relationships among leaf phenolic compounds. We then used scree plots and visual inspection of phenolic compound loadings to choose interpretable principal componenents. All PCs were performed on the correlation matrix to give equal weight to each phenolic compound.