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Re: regression with error bars [message #71067 is a reply to message #70918]

Sat, 22 May 2010 10:53

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On May 22, 12:44 pm, Meagan A. <u...@compgroups.net/> wrote:
> One more question, please.
>
> In:
> RESID = (RESID_PLUS GT 0)*RESID_PLUS + (RESID_MINUS LT
> 0)*RESID_MINUS
>
> Shouldn't we subtract the two resids instead of adding them? Thank you again!

Not really. The "addition" there is an IDL vectorized short-hand
notation for, "if residuals are greater than zero use RESID_PLUS;
otherwise use RESID_MINUS". Only one clause of expression is non-
zero, so you are never really adding or subtracting residual values.

Craig

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[Message index]

		regression with error bars By: Meagan Adams on Tue, 04 May 2010 12:57
		Re: regression with error bars By: Craig Markwardt on Tue, 04 May 2010 19:19
		Re: regression with error bars By: Giuseppe Papa on Sat, 22 May 2010 09:44
		Re: regression with error bars By: Craig Markwardt on Sat, 22 May 2010 10:53
		Re: regression with error bars By: Giuseppe Papa on Sat, 22 May 2010 09:29
		Re: regression with error bars By: Craig Markwardt on Sat, 22 May 2010 08:02
		Re: regression with error bars By: Giuseppe Papa on Sat, 22 May 2010 06:34

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