Well, you can do this, but there's no guarantee that the resulting
correlation matrix will be positive definite. And what would principle
components based on this mean even if it is positive definite?

-- Bert

On Wed, Mar 20, 2013 at 3:14 PM, Dimitri Liakhovitski <
dimitri.liakhovitski@gmail.com> wrote:

> 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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>
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

Internal Contact Info:
Phone: 467-7374
Website:
http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm

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