Fig. 1
From: A biplot correlation range for group-wise metabolite selection in mass spectrometry
a The combination of a principal component score plot and a principal component loading plot, called a biplot, is used to illustrate the concept of biplot correlation range. Based on the “+” score plot values and the associated ellipse (broken line), a 95% confidence interval is calculated for projection onto the corresponding loading plot (small circles). Filled red circles contribute to scores within the 95% correlation range, while the thick-lined ellipse represents the top 5% of features contributing to the “+” class. b The flow of the decomposition of input data X