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Re: REGRESS and sky background [message #71657 is a reply to message #71656]

Tue, 06 July 2010 06:18

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Jul 5, 8:06 pm, Gray <grayliketheco...@gmail.com> wrote:

> Here's my general algorithm; I actually use a different mean clipping
> routine, but astrolib's MEANCLIP gives the same (unwanted) results.
> Take a look and tell me what you think. Thanks!

Some possibly useful thoughts.

1. I don't understand this line

abc += [ab,c]

On each iteration you are removing outliers and redoing the
regression. But you don't want to add the newly determined
parameters to the old ones - I think you want a simple equality in the
above statement.

2. REGRESS has a lot of keywords -- STATUS, SIGMA, CHISQ -- to help
assess the quality of the solution. I would monitor these to see if

3. Henry Freudenreich wrote code for a similar problem -- check out
robust_planefit.pro and supporting procedures in
http://idlastro.gsfc.nasa.gov/ftp/contrib/freudenreich/

--Wayne

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[Message index]

		Re: REGRESS and sky background By: Gray on Tue, 06 July 2010 12:50
		Re: REGRESS and sky background By: Gray on Tue, 06 July 2010 12:49
		Re: REGRESS and sky background By: Jeremy Bailin on Tue, 06 July 2010 07:51
		Re: REGRESS and sky background By: Jeremy Bailin on Tue, 06 July 2010 06:19
		Re: REGRESS and sky background By: wlandsman on Tue, 06 July 2010 06:18

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