Hello!
I am running principle components analysis using princomp function in
pacakge psych.

mypc <- princomp(mydataforpc, cor=TRUE)

Question: I'd like to use pairwise deletion of missing cases when
correlations are calculated. I.e., I'd like to have a correlation between
any 2 variables to be based on all cases that have valid values on both
variables.

What should my na.action be in this case?

Thank you very much!
-- 
Dimitri Liakhovitski

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