On Jan 22, 2009, at 11:06 AM, Georg Ehret wrote:
Dear Miss R,
I have a large dataset that is skewed and would like to calculate
confidence intervals for my regression line. Unfortunately I have
trouble
finding commands for rubust regression and in particular for the
confidence
intervals... Can you possibly give a hint?
Such difficulty is inexplicable.
Search with Google for "robust regression" and add r-project to your
search string for narrowing.
(First hit is John Fox's 4 page addendum to CAR with worked examples.
Many hundreds of hits but with high chance that the count is inflated.
Further addition of "confidence intervals" still produces hundreds of
results.)
Search r-site-search for "robust regression"
http://search.r-project.org/nmz.html
(roughly 300 hits)
See also the CRAN TAsk View on Robust Statistical Methods:
http://cran.r-project.org/web/views/Robust.html
(I have had very satisfactory results with Koenker's quantreg package
functions, but you have provided insufficient description of a) the
data, b) the domain of analysis, or c) your goals to allow any comment
on the need or applicability of methods to your tasks.)
--
David Winsemius
Thank you and best regards, Gerog.
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