# Re: st: loneway and intraclass correlation

 From "Jacki Buros" To statalist@hsphsun2.harvard.edu Subject Re: st: loneway and intraclass correlation Date Tue, 26 Sep 2006 12:06:12 -0400

```and, it should also be 'loneway num id'

On 9/26/06, Jacki Buros <jburos@gmail.com> wrote:
```
```This should be 'reshape long num, i(id) string' rather than the
reshape command below.

Jacki

On 9/26/06, Jacki Buros <jburos@gmail.com> wrote:
> 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
>
>
>   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
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/support/faqs/res/findit.html
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
> >
>

```
```*
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```