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RE: st: composite index

From   "Joon G. Park" <>
To   "''" <>
Subject   RE: st: composite index
Date   Fri, 17 Nov 2006 01:07:15 -0600

Dr. Williams, 

Thanks for the quick feedback. 
At this point, I think the use of z-scores may the best option. Thanks,


-----Original Message-----
[] On Behalf Of Richard Williams
Sent: Thursday, November 16, 2006 9:13 PM
Subject: Re: st: composite index

At 08:39 PM 11/16/2006, Joon G. Park wrote:
>I have a quick question on creating a composite index. I've searched 
>for this topic on Stata listserv, but without success.
>But, anyways, here is my situation:
>I have the following three variables:
>Variable "A" (Scale: millions; range: from hundreds of thousands to 
>millions; Unit: dollar)
>Variable "B" (Scale: hundreds; Range: from single digits to three 
>double digits; Unit: "size")
>Variable "C" (Scale: hundreds; Range: from less than ten to tens of 
>thousands; Unit: personnel)
>I would like to have equal weights attached for each variable that 
>will comprise the composite index (I may use weighted index later 
>on, depending on how my theory works out). This would seem 
>accomplished easily enough via "generate" command with relevant math

I guess the question is, why would you think that equal weights are 
appropriate, given how different the scales are?  You could do 
rescalings, but if you do that that is the same as using different 
weights.  It seems like a factor analysis makes as much sense as 
anything, assuming you even want to create a scale in the first 
place.  Or, maybe create z-scores from the 3 variables and add them

Richard Williams, Notre Dame Dept of Sociology
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