On Tue, 5 Aug 2008, Gareth Campbell wrote:
Hi there,
I'm plotting some glass RI values just by plotting
plot(x)
then I put on my lowess smoother
lines(lowess(x))
now I want to put on some 95% Confidence Interval bands of the lowess
smoother, but don't know how??
You can have pointwise confidence intervals or a simultaneous confidence
band, so which did you mean?
I don't know of any theory for the latter, whereas for the former lowess
is a locally linear fit and hence there will be asymptotic results not
very relevant for local fits.
Looks like a case for simulation-based inference, e.g. via a bootstrap.
Thanks
--
Gareth Campbell
PhD Candidate
The University of Auckland
P +649 815 3670
M +6421 256 3511
E [EMAIL PROTECTED]
[EMAIL PROTECTED]
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--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
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