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Re: REGRESS Question [message #32061 is a reply to message #31982]

Thu, 05 September 2002 10:31

William Clodius
Messages: 30
Registered: December 1996

Member

David Fanning wrote:

> Folks,
>
> I have a client who has asked me to create a pixel density
> function between two images and then perform a regression
> analysis on the resulting distribution. No problem doing all
> this, but she finds that the results of my regression analysis
> differ from the same analysis performed in other statistics
> packages. In fact, three different packages give the same
> answer, and then there is IDL. :-(
>
> For example, if the other packages calculate a "goodness
> of fit" of 0.95, IDL might report 0.97.
>
> Here is my question. Are there any known problems with REGRESS?
> Or, can I assume that this problem comes from my own mathematical
> ignorance?
>
> Cheers,
>
> David

<snip>

Almost any package can have problems, but the original REGRESS in
Bevington has stood the test of time. IDL's version works for me, but it
is possible that the introduced some problems. One thing that bothers
me is tha 0.95 is to a good approximation 0.97^2. Could you be fitting
the square root of the customer's data.

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[Message index]

		REGRESS Question By: David Fanning on Wed, 04 September 2002 14:21
		Re: REGRESS Question By: Mike Alport on Fri, 06 September 2002 00:26
		Re: REGRESS Question By: julia[1] on Thu, 05 September 2002 11:31
		Re: REGRESS Question By: William Clodius on Thu, 05 September 2002 10:31
		Re: REGRESS Question By: justspam03 on Wed, 22 October 2003 07:01
		Re: REGRESS Question By: wmconnolley on Wed, 22 October 2003 06:03
		Re: REGRESS Question By: Chris Lee on Wed, 22 October 2003 03:44
		Re: regress question By: Wout De Nolf on Mon, 01 December 2008 00:38
		Re: regress question By: mccreigh on Sun, 30 November 2008 23:42
		Re: regress question By: Kenneth P. Bowman on Sat, 29 November 2008 07:58
		Re: regress question By: Brian Larsen on Thu, 27 November 2008 07:37
		Re: regress question By: Wout De Nolf on Thu, 27 November 2008 02:47

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