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The following data represent p = 22 physical and chemical measurements for n = 8 samples of crude oil (McCammon, 1966).

(a) Using a Q-mode approach perform a PCA of the n = 8 samples, using the cosine measure.

(b) Carry out a PCA of the (8 x 8) correlation matrix of the samples. How do the scores differ from those in part a?

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