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Re: How to determine the WEIGHTS in MPFITFUN for distribution function fit? [message #55769 is a reply to message #55765]

Thu, 06 September 2007 11:26

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

hradilv <hradilv@yahoo.com> writes:
> Boy, that's a good question ... Here are some questions for you.
> How do you measure the counts? How sure are you of the number of
> counts?
> If they are truly counts, the errors may be Poisson distributed, yerr
> ~ 1/y. Have you tried this?

If Y is measured counts, then the YERR should be ~ SQRT(Y), right?

But overall I agree, the original poster needs to specify how the
numbers were measured in order to estimate the measurement error.

Craig

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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@REMOVEcow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: How to determine the WEIGHTS in MPFITFUN for distribution function fit? By: duxiyu@gmail.com on Thu, 06 September 2007 22:26
		Re: How to determine the WEIGHTS in MPFITFUN for distribution function fit? By: duxiyu@gmail.com on Thu, 06 September 2007 21:43
		Re: How to determine the WEIGHTS in MPFITFUN for distribution function fit? By: Craig Markwardt on Thu, 06 September 2007 11:26
		Re: How to determine the WEIGHTS in MPFITFUN for distribution function fit? By: Vince Hradil on Thu, 06 September 2007 06:52
		Re: How to determine the WEIGHTS in MPFITFUN for distribution function fit? By: Vince Hradil on Tue, 11 September 2007 07:15
		Re: How to determine the WEIGHTS in MPFITFUN for distribution function fit? By: Craig Markwardt on Mon, 10 September 2007 22:21

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