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Re: st: loneway and intraclass correlation


From   "Jacki Buros" <jburos@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: loneway and intraclass correlation
Date   Tue, 26 Sep 2006 11:41:33 -0400

I could be wrong, but I think loneway requires that the first variable
be the response and the second designate your group. So to compute ICC
of X and Y you would first want to reshape your data to be long, ie

instead of

  id    numX    numY
  1     25         32
  2     12         17

you would type 'reshape num, i(id) string' to get

  id   num    _j
  1    25      X
  1    32      Y
  2    12      X
  2    17      Y

Then 'loneway num numtype' should give you the ICC you are looking for.

Jacki


On 9/26/06, Joe Trubisz <jtrubisz@mac.com> wrote:
In Martin Bland's book on medical statistics, he says:

Sometimes we have pairs of observations where there is no obvious
choice between X and Y. The choice of X and Y is arbitrary.

He then goes on to discuss intraclass correlation.

I have a set of data which meets this criteria and if I run 'loneway
x y' and 'loneway y x', I get 2-different ICC values, which I can
expect.

However...what I don't know is what to do with the different values.
Is one better than the other? How do I select which ICC value is
actually the one I should be using?

Thanks,
Joe
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