Hi! I'm performing a PCA in R Studio for behavioral data and I note in many tutorials a plot (for variables or individuals) which displays cos2, according to the tutorials, cos2 is "the quality of the representation of a column or a row" but what does it mean?
Thank you!
It shows the importance of a principal component for a given observation (vector of original variables). You can go through the following link for details.
http://www.utdallas.edu/~herve/abdi-awPCA2010.pdf
It shows the importance of a principal component for a given observation (vector of original variables). You can go through the following link for details.
http://www.utdallas.edu/~herve/abdi-awPCA2010.pdf
Check 'Multivariate Analysis' by Johnson and Wichern - pretty good book.
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