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kjwx109
kjwx109
Level II

scores plot for PCA

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Created: May 15, 2022 09:50 AM  |  Last Modified: Jun 8, 2023 5:49 PM (490 views)

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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Thierry_S
Super User Thierry_S
Super User

Re: scores plot for PCA

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Created: May 15, 2022 02:50 PM  |  Last Modified: May 15, 2022 11:50 AM (480 views)  |  Posted in reply to message from kjwx109 05-15-2022

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,

TS

Thierry R. Sornasse