LOESS (aka LOWESS)

[Mr. No Address]

Been some time since I was here and now I'm almost fearful to post.
Have I googled enough? Have I searched CPAN enough? Did I read all the
books? Have I done everything reasonable to try and answer my question
before posting here? Ah, what the hell...

Locally Weighted Robust Regression (LOWESS or LOESS). Boss says it's
the thing to use for a particular job that needs to be done. Is there a
Perl module out there that does this?

 

[usenet]

Been some time since I was here and now I'm almost fearful to post.
Have I googled enough? Have I searched CPAN enough? Did I read all the
books? Have I done everything reasonable to try and answer my question
before posting here?

You forgot the MOST important thing: have you read the posting
guidelines for this group?

http://mail.augustmail.com/~tadmc/clpmisc/clpmisc_guidelines.html

 

[A. Sinan Unur]

Been some time since I was here and now I'm almost fearful to post.
Have I googled enough? Have I searched CPAN enough? Did I read all the
books? Have I done everything reasonable to try and answer my question
before posting here? Ah, what the hell...

Interesting attitude.

Locally Weighted Robust Regression (LOWESS or LOESS). Boss says it's
the thing to use for a particular job that needs to be done. Is there a
Perl module out there that does this?

I am not sure why one would use Perl for this task. There is a regression
module which I have used in the past, and could be used to compute the
local weighted regressions at each point.

http://www.mathworks.com/access/helpdesk/help/toolbox/curvefit/ch_data7.html
http://www.itl.nist.gov/div898/handbook/pmd/section1/pmd144.htm

I would be much more inclined to use a numeric computation package for
this, say, S-Plus (or R), MatLab (or Octave), Mathematica, Gauss, SAS, or
even use some Fortran code from netlib:

See also:

http://cm.bell-labs.com/cm/ms/departments/sia/wsc/smoothsoft.html

Sinan

 

[xhoster]

Been some time since I was here and now I'm almost fearful to post.
Have I googled enough? Have I searched CPAN enough? Did I read all the
books? Have I done everything reasonable to try and answer my question
before posting here? Ah, what the hell...

Locally Weighted Robust Regression (LOWESS or LOESS). Boss says it's
the thing to use for a particular job that needs to be done. Is there a
Perl module out there that does this?

Did the boss say you had to do it in Perl? I'd seriously consider using R
for this, perhaps interfaced to Perl.

Xho

 

[Mr. No Address]

I am not sure why one would use Perl for this task. There is a regression
module which I have used in the past, and could be used to compute the
local weighted regressions at each point.

http://www.mathworks.com/access/helpdesk/help/toolbox/curvefit/ch_data7.html
http://www.itl.nist.gov/div898/handbook/pmd/section1/pmd144.htm

I would be much more inclined to use a numeric computation package for
this, say, S-Plus (or R), MatLab (or Octave), Mathematica, Gauss, SAS, or
even use some Fortran code from netlib:

See also:

http://cm.bell-labs.com/cm/ms/departments/sia/wsc/smoothsoft.html

I'm sure Perl isn't the best choice from a programming sense, but it is
what I know so I was curious if a solution existed. I'm aware that R
includes this so I'll probably end up going with that, though I don't
know R so there will be an additional hurdle to get past.

 

[Mr. No Address]

You forgot the MOST important thing: have you read the posting
guidelines for this group?

http://mail.augustmail.com/~tadmc/clpmisc/clpmisc_guidelines.html

Yes I have, but neglected to add that to my list above. What an
omission! Cheers!

 

[Mr. No Address]

Did the boss say you had to do it in Perl? I'd seriously consider using R
for this, perhaps interfaced to Perl.

Thanks for your comment. That is the direction I'm heading.