Investigating control-centred results after uncentred principal component analysis

John Castura/ June 14, 2024/ Oral Presentation/ 0 comments

Test-control paired comparisons can be investigated after principal component analysis (PCA). We show that a centred PCA of test-control paired comparisons is equivalent to an uncentred PCA of control-centred results. We demonstrate how to conduct these analyses. We illustrate key properties of centred and uncentred PCA. We justify why coordinates of control-centred results can be visualized in principal components obtained from test-control paired comparisons. The benefit of situating the control product at the origin of score plots is described. The proposed methods are illustrated using data from a sensory quantitative descriptive analysis of a control product and nine test product formulations.


Castura, J.C., Cariou, V. & Næs, T. (2024). Investigating control-centred results after uncentred principal component analysis. Sensometrics 2024. 3-6 June. Paris, France. (Oral Presentation).

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