Error rates of the ensemble members of Random Forest (left) and LDA (right) for the classification into classes EA/EB/EW using Hipparcos, as a function of the number of light curve shape attributes. The ensemble median global error rate is plotted in black (with superimposed black squares), and the range of its (0.1, 0.9) quantiles in grey, highlighted by a thin black line. The same quantities on the three classes are shown in orange (EA), blue (EB) and pink (EW). The models contain period and peak-to-peak amplitude beside the PCs, whose number is indicated in the x-axis of the plot.