[R] OT: compare several graphs

Bill Simpson wsi at gcal.ac.uk
Tue Oct 23 10:10:43 CEST 2001

On Mon, 22 Oct 2001, Kaspar Pflugshaupt wrote:

> On 22.10.2001 15:30 Uhr, Jan_Svatos at eurotel.cz wrote:
> > 
> > Hi Sven,
> > 
> > I am just doing something similar-
> > my graphs are densities of nonnegative r.v's (with all probability mass at
> > fixed bounded interval).
> > Then I compute their "distance" by dist (mva package needed), i.e.
> > 
> > my.dist<-dist(t(cbind(dens1$y, dens2$y)))
> > 
> > (provided that dist1$x==dist2$x, of course)
> > The problem of course is, how to decide about statistical and/or
> > "practical" significance of a difference.
> > I cannot remain myself of some correct statistical test of such hypothesis
> I'm not sure if this is statistically sound (comments, please!), but what
> about a resampling approach:
As I told Sven directly, the tricky part about his data is that he has
time series. So he needs to take into account the correlated errors. But
nlme and Jim Lindsay's libraries will handle nonlinear models with
correlated errors.

Your suggestion doesn't take the correlated errors into account.


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