[R] princomp

Peter Ho peter at esb.ucp.pt
Thu Sep 9 15:16:23 CEST 1999

hi Hoon,

>   As I understand your Q. You probably have data that is similar to each other
> like stock Prices for all RHS variable. In that case the difference between corr
> and cov is not significant; however, if your RHS contains totally dissimilar
> variables it matters a great deal. If x1 income, x2 job type, x3 Education
> level, etc..., then taking cov of these variables would not be desireable and it
> should have different result from corr. BTW: Factor Anal is very similar.
>   Hope this helps, (and right ;)

In fact I have variables which have different scales, so in fact what I want to do
is to standardise the variables and then use a correlation matrix.


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