How to identify points on a pca residual qqplot in R?

Asked May 30 '23 at 23:01

Active May 30 '23 at 23:01

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I plotted the residuals of my pca with the following function: plot(resid(pca1)). And here is the graph I have.

I would like to identify the two outliers on the top right but I don't know how to do that. Knowing that the "identify" function does not seem to work with plot(resid()) functions.

PS: I don't know why the first points are labeled. It was like that automatically.

Thank you so much in advance for your help!

asked May 30 '23 at 23:01

Lea_c

Hi, can you tell us how you calcualted the PCA? Did you use princomp or prcomp or an other library? – user12256545 May 30 '23 at 23:12
try plot(hatvalues(pca1)) if pca1 is a model itself. – user12256545 May 30 '23 at 23:18
Sure, I used the principal function of the psych library: pca1 = psych::principal(data, nfactors=2, rotate = "varimax", scores = TRUE – Lea_c May 31 '23 at 14:37

How to identify points on a pca residual qqplot in R?

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