From: Eric-Olivier Le Bigot <Eric.Le.Bigot_at_spectro.jussieu.fr>

Date: Wed 20 Apr 2005 - 18:47:50 EST

Date: Wed 20 Apr 2005 - 18:47:50 EST

Hello all,

Do you know of convenient functions that can do:

- a fit "f(x)" of data points with a spline, and *then*
- weighted fits of other data points ** with a model of the form a*f(x-x0) **? [i.e., the goal is to find a and x0, ideally with their covariance matrix], and
- if possible, the same as (2) above, but with the same model *convoluted with a gaussian* (whose height and width should be fitted).

R looks really powerful for doing these kind of things, and I'd like to use it for analyzing X-ray spectra.

After doing some research, I came accross a few packages: gss, stats, assist, psline; but I have not yet been able to figure out a way of performing the fits with splines described in (2) and (3) above.

Any help would be welcome!

EOL [new to R, and not a statistician--only a physicist]

-- Dr. Eric-Olivier LE BIGOT (EOL) CNRS Associate ResearcherReceived on Wed Apr 20 19:15:43 2005

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