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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