### Principal component analysis (PCA)

The panel depicts a plot of PCA. The data input can be **scale**d and 
**center**ed prior to calculating the principal components by adjusting the
respective tick marks. The different PCs can be displayed by changing the
values in the drop-down menus for the x-axis and y-axis. 

A scree plot, showing the explained variance per PC, is displayed in the 
right panel.