[R] Smooth monotone estimation on R

[Kjetil Halvorsen]

Hola!

Experimenting a little, package fda seems very much under development, 
and help pages are definitely not finished.
It would certainly help to read the book "functional data analysis" by 
the author of fda, which is in our library.
On the other hand package mgcv is more mature, so it would seem easier 
to use that.

It is not totally automatic, but the example
library(mgcv)
example(mono.con)

has everything necessary to get started.

Kjetil Halvorsen

Eliyahu-Oron wrote:

>Kjetil and Andy,
>
>Thanks for your helpful answers! The first two (mgcv and fda) seem to be in
>the direction I'm looking for. I downloaded them both.
>
>I'm running into a lot of implementation difficulties, though. I wonder if
>there's anyone who tried to do a monotone spline using either the 'mgcv' or
>the 'fda' packages, whom I could ask directly?
>
>Thanks again, Assaf
>
>-----Original Message-----
>From: Kjetil Halvorsen [mailto:kjetil at acelerate.com]
>Sent: Monday, July 12, 2004 4:32 PM
>To: Assaf P Oron
>Cc: R-help at stat.math.ethz.ch
>Subject: Re: [R] Smooth monotone estimation on R
>
>
>help.search()
>on my machine turns up only:
>
>mono.con(mgcv)          Monotonicity constraints for a cubic
>                        regression spline.
>
>smooth.monotone(fda)    Monotone Smoothing of Data
>pmreg(ftnonpar)         Piecewise monotone regression with taut
>                        strings
>backSpline(splines)     Monotone Inverse Spline
>isoreg(stats)           Isotonic / Monotone Regression
>
>so you should find something of use in packages mgvc, fda, ftnonpar, splines
>or stats (.loaded by default)
>
>Kjetil Halvorsen
>
>
>Assaf P Oron wrote:
>
>  
>
>>Hi all,
>>
>>I'm looking for smooth monotone estimation packages, preferably using
>>    
>>
>splines.
>  
>
>>I downloaded the 'cobs' package and intend to use it, but since it offers
>>    
>>
>only quadratic splines based on L1 minimization, I'd like to compare its
>performance to that of a more 'mainstream' cubic-spline, L2-norm minimizing
>spline. Preferably a smoothing spline.
>  
>
>>Does anyone know of such code existing anywhere? Or another smooth monotone
>>    
>>
>alternative?
>  
>
>>Thanks in advance,
>>
>>Assaf Oron
>>Statistics Department
>>University of Washington
>>
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