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Re: xerr [message #64275 is a reply to message #64274]

Wed, 17 December 2008 13:29

Vince Hradil
Messages: 574
Registered: December 1999

Senior Member

On Dec 17, 2:27 pm, lakshmi <lax...@gmail.com> wrote:
> Hi,
>
> I've been using mpfitfun to fit measured values of period (y) and
> distances (x) in a linear equation y = a + bx.
> I would like to know if we can include the measured uncertainties in x
> values too?
>
> Thanks,
>
> Lakshmi

Well, since it's a linear problem you should probably choose a linear
solution, not mpfitfun. Also, you need to take into account the
variance and covariance for both x and y, so you need to solve this
with care.

If you google "fitting a straight line when both variables are subject
to error" you'll get a lot of info: http://tinyurl.com/54m8l3

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[Message index]

		Re: xerr By: laxsri on Wed, 17 December 2008 14:41
		Re: xerr By: laxsri on Wed, 17 December 2008 14:34
		Re: xerr By: pgrigis on Wed, 17 December 2008 14:08
		Re: xerr By: Vince Hradil on Wed, 17 December 2008 13:29
		Re: xerr By: Craig Markwardt on Thu, 18 December 2008 19:24
		Re: xerr By: Jeremy Bailin on Thu, 18 December 2008 06:49
		Re: xerr By: wlandsman on Thu, 18 December 2008 05:31

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