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Re: st: 1-4 scale


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: 1-4 scale
Date   Mon, 6 Aug 2012 09:25:03 +0200

On Sun, Aug 5, 2012 at 7:03 PM, David Hoaglin wrote:
> When you have the results from the model with the eight separate
> items, you may want to see whether the coefficients for the four items
> within a heading are similar. If they are, and it makes sense, you
> could consider replacing those four items with their sum (or average)
> --- a composite score.

That can be a useful strategy. To be explicit: in that case you'll be
constraining the effects of the four item to be the same. See, e.g.
M.L. Buis (2012) "Stata tip 108: On adding and constraining", The
Stata Journal, 12(2), pp. 342-344.

-- Maarten
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