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st: RE: AW: PCA results and new variable


From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: AW: PCA results and new variable
Date   Thu, 11 Mar 2010 12:44:13 -0000

-help pca- explains how you can save values of the first component. 

-help sum()- explains how to calculate cumulative sums. 

Nick 
[email protected] 

[email protected]

Regarding the official example, I would need to make,

*************
sysuse auto, clear
bys foreign: pca trunk weight length headroom

and then create a new variable with the cumulative of the first
compenent
of each group (foreign or domestic)assigned to each "car".

"Martin Weiss" <[email protected]>

-statsby- could be your friend, but you really need to frame your
question
in terms of an official example:

sysuse auto, clear
bys rep78: pca trunk weight length headroom

[email protected]

I am performing a PCA analysis of specific firms'(id) characteristics
(varname) within regions.
I would like to know if it possible to create a new variable with the
results of the cumulative of the first component to be assigned to each
firm (id).

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