A Comparison Study of Two Methods for Principal Component Analysis of Interval Data

A simplified method of VPCA was raised by Cazes P. The proposed method eliminates large amounts of redundant computation by calculating correlation matrix of the vertices matrix directly. A comparison study of VPCA and the simplified method shows that the two methods lead to the same results. However, the simplified method has higher speed and smaller occupied-space. An empirical analysis verified the conclusion of theoretical analysis.