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scores plot for PCA

The scores plot has a circle inside the scatterplot. Does this represent a confidence interval or is it more for decorative purposes? If the former, can the confidence interval be changed?

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Re: scores plot for PCA

Hi,

I believe that you are referring to the Loading Plot, where the circle represents the maximum possible contribution of each variable (i.e., Distance from zero = 1). The length of the vectors (arrows) represents the relative contribution of each variable to the principal components displayed.

Best,

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