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Re: weighted least squares fit with error in both y and x [message #30525 is a reply to message #30524]

Sun, 05 May 2002 15:40

Wayne Landsman
Messages: 117
Registered: January 1997

Senior Member

Kim Nielsen wrote:

> Hi,
>
> I am fitting a straight line to a data (x,y) set with error in both
> coordinates (sigma_x and sigma_y).
> Is there an easy way in IDL to obtain the paramaters with their errors

The "Numerical Recipes" iterative algorithm for solving this problem is
implemented in

http://idlastro.gsfc.nasa.gov/ftp/pro/math/fitexy.pro

Several other procedures (MINF_BRACKET, MINF_PARABOLIC, ZBRENT ) from the
above directory are also required.

--Wayne Landsman landsman@mpb.gsfc.nasa.gov

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		Re: weighted least squares fit with error in both y and x By: ftksn1 on Sun, 05 May 2002 18:32
		Re: weighted least squares fit with error in both y and x By: Wayne Landsman on Sun, 05 May 2002 15:40

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