What can I do when outliers still exist after log transforming data?

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Arne Andersen

Have you considered whether the outliers are due to natural variation? Nature is not always as simple as one might wish.

Emmanuel Rodriguez Rivera

You need to use the raw data without units, make the PCA and biplot the two first PCs. It is true nature is not always perfect so you may have dots that significaly chage your aritmetic mean therefore the PCA.