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re: st: loneway and intraclass correlation
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?
I don't agree with the premise. I think the intraclass correlation is
a measure of variation within compared to between classes. One of the
variables should be continuous (Y) and the other a class or
categorical variable (X) to use loneway (or xtmixed). In your
situation, are both your variables continuous measures? To me, that
would make sense and if you switch either variable as dependent
variable, you still would get the same correlation, if you used
Stata's "correlate" command.
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