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Re: xerr [message #64274 is a reply to message #64273]

Wed, 17 December 2008 14:08

pgrigis
Messages: 436
Registered: September 2007

Senior Member

This is discussed for example in
section 15.3 in edition 3 of the book
"numerical recipes".

Ciao,
Paolo

Vince Hradil wrote:
> 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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