PCA minimizes the error along the PC axis. Here's a nice article that goes into more detail: http://www.r-bloggers.com/principal-component-analysis-pca-vs-ordin

PCA minimizes the error along the PC axis. Here's a nice article that goes into more detail: http://www.r-bloggers.com/principal-component-analysis-pca-vs-ordinary-least-squares-ols-a-visual-explanation/ http://www.r-bloggers.com/principal-component-analysis-pca-v...