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Thread Subject:
Robust lowess smoothing of data that contain outliers

Subject: Robust lowess smoothing of data that contain outliers

From: Liana

Date: 22 Mar, 2011 05:41:04

Message: 1 of 3

Hello!

Which built-in functions can be used to implement robust lowess smoothing of data that contain outliers? I found some info about robust local regression here: http://www.mathworks.com/help/toolbox/curvefit/bq_6yqb.html#bq_6ys3-8, however there is nothing mentioned about functions used to implement such procedure.

Any help will be appreciated.

Thanks.

Subject: Robust lowess smoothing of data that contain outliers

From: Sean de

Date: 22 Mar, 2011 05:58:04

Message: 2 of 3

"Liana" wrote in message <im9cpg$41i$1@fred.mathworks.com>...
> Hello!
>
> Which built-in functions can be used to implement robust lowess smoothing of data that contain outliers? I found some info about robust local regression here: http://www.mathworks.com/help/toolbox/curvefit/bq_6yqb.html#bq_6ys3-8, however there is nothing mentioned about functions used to implement such procedure.
>
> Any help will be appreciated.
>
> Thanks.

doc smooth

e.g:
smooth(x,y,'rlowess');

Subject: Robust lowess smoothing of data that contain outliers

From: Doug Weathers

Date: 6 Jun, 2011 20:42:05

Message: 3 of 3

"Sean de " <sean.dewolski@nospamplease.umit.maine.edu> wrote in message <im9dpc$iln$1@fred.mathworks.com>...

> doc smooth
>
> e.g:
> smooth(x,y,'rlowess');

FYI, this function is only included in the Curve Fitting toolbox.

You can find some others here in the File Exchange by searching for "lowess".

For example,

http://www.mathworks.com/matlabcentral/fileexchange/22470-lowess-locally-weighted-scatterplot-smoothing-for-linear-and-non-linear-data-enhanced

Disclaimer: I'm just now starting to play with this one, so I don't know how well it works yet.

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