Biplot by Groups

Biplot function that can plot scores in multiple groups with different formats

This is an alternative biplot that is able to show scores in different colors (groups). Useful in the identification of explanatory variables in PCA analysis.
BiplotG is only able to plot 2 components (2D) and does not impose any sign convention (loadings and scores are never flipped). It is much faster than 'biplot for big data sets.