Eric Turkheimer schrieb:
>
> I am interested in whether there is a literature on variance smoothers.
> What I want to do is to plot the variance of a variable as a smooth
> function of the values of another variable. It would seem as though
> most of the methods for bivariate smoothers should work, but I can't
> find any theory on the matter.
>
> So for example, suppose I am interested in the variance of height as a
> function of income. I could create a "running variance" by computing
> the variance of height for the k cases with the lowest income, then
> slide the window up and recompute for the 2 to k+1 lowest incomes, and
> so forth, to the k highest. Most weighting and kernel schemes could be
> applied in the same way.
>
> Any info appreciated...
>
> Eric Turkheimer
> [EMAIL PROTECTED]
Would you mind to forward any information to me, that eventually
reach you? I ran into the same problem.
Gottfried.
--
Gottfried Helms Soz.Paed./Soz.Arb.
email: mailto:[EMAIL PROTECTED]
www : http://www.uni-kassel.de/~helms
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