The toolbox is freeware and may be used (but not modified and distributed) if proper reference is given to the authors. Preferably refer to the following paper:

D. Ballabio (2015), A MATLAB toolbox for Principal Component Analysis and unsupervised exploration of data structure, Chemometrics and Intelligent Laboratory Systems, 149 Part B, 1-9
(doi: 10.1016/j.chemolab.2015.10.003)

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In short, no guarantees, whatsoever, are given for the quality of this toolbox or for the consequences of its use. It is inevitable that there will be some bugs, but we have tried to test the algorithms thoroughly.

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