Dear Statalisters,
Following Nick's reply on my previous posting I was not able to locate the
reference:
Fan, Fan, and Gijbels, "Local Polynomial Modelling and Its Applications",
in Monographs of Statistics and Applied Probability, Chapman and Hall/CRC.
(1) I would like ask the authors of the -locpoly- command and whoever is
familiar with the command whether the following references are sufficient
in explaining the algorithm of -locoply-:
Hardle (1990), Applied Nonparametric Regression, Econometric Society
Monographs, Cambridge Press.
Cleveland (1979), "Robust Locally Weighted Regression and Smoothing
Scatterplots", Journal of the American Statistical Association, Vol.74,
No.368, pp.829-836.
Muller (1987), "Weighted Local Regression and Kernel Methods for
Nonparametric Fitting", Journal of the American Statistical Association,
Vol.82, No.397, pp.231-238.
(2) Has anyone written something on nonparametric smoothing for
higher-dimensions, i.e. more than one explanatory variables ?
(3) How can I statistically compare (given a confidence level) the
parametric fit "y-hat" with the non-parametric fit "conditional-y-mean" ?
Has anyone written a statistical test such as the one described in
Hardle(1990, ch.9.3) for the qsuared deviation between the two measures ?
many thanks in advance,
Dimitris
Nick Cox wrote:
>
> -locpoly- is a user-written program, except
> that the authors are all also StataCorp employees
> currently enjoying Memorial Day weekend: see
>
> http://www.stata.com/info/about.html
>
> -locpoly- was written up in the Stata Journal
> 4(3) 2003, and that write-up includes an array
> of references. One is the monograph by Fan and Gijbels
> on local polynomial modelling from Chapman and Hall
> (now CRC Press).
>
> -locpoly- is, I think, not accurately described as an
> extension of the user-written -kernreg-. It is
> a completely independent program. Both show
> some influence of -kdensity-: that's where the
> relationship lies if there is one.
>
> Confidence intervals do not appear to be built
> in. No doubt someone somewhere has written how
> to do this, with some extra work.
>
> Nick
> [email protected]
>
> [email protected]
>
> > Is it possible to construct and graph confidence intervals
> > with the -locpoly-
> > nonparametric regression smooth?
> >
> > Also, the -locpoly- help file does not point to any
> > references. Is the -locpoly-
> > an extension of the -kernreg- but with a polynomial fit instead?
>
> *
> * 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/
--
---------------------------------------------
Dimitris Christodoulou
School for Business and Regional Development
University of Wales, Bangor
Hen Coleg
LL57 2DG Bangor
UK
e-mail: [email protected]
---------------------------------------------
*
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* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
