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Re: st: Comparing two response variables


From   Joerg Luedicke <joerg.luedicke@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Comparing two response variables
Date   Mon, 28 Feb 2011 19:52:15 -0500

On Mon, Feb 28, 2011 at 6:20 PM, Debs Majumdar <debs_stata@yahoo.com> wrote:

> Is there anyway to prove Y1 is a better measure for the trait we are measuring
> when compared to Y2?

"Better" with regard to what? As far as I understand your question you
mean something like "better" in the sense of higher validity of your
measurement instrument. Only if you know exactly how the proposed
relation to x1 and x2 is supposed to look like in this multivariate
context, e.g. if your measure was validated before in other studies,
the model could provide some evidence in favor of the one or the
other. In the absence of such knowledge, there is no model that would
tell you that. Basically, you need external and conceptual information
to decide on what the better measure is.

J.
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