What is the meaning of only positive loadings in PCA when I have negative scores on the studied PC,?

Amal Ben Hadj Mabrouk @Amal-Ben-Hadj-Mabrouk

16 April 2021 0 9K Report

I am running PCA on my mass spectrometry spectras (TOF-SIMS in negative mode) and I am running PCA on my polymers samples however for the PC1 90% : I only have positive loadings when clearly I have negative scores.

Anyone can help?

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