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Re: linfit and regress questions [message #56686]

Mon, 12 November 2007 02:02

rlayberry
Messages: 33
Registered: November 2004

Member

On 11 Nov, 16:49, hradilv <hrad...@yahoo.com> wrote:
> On Nov 11, 10:42 am, rlaybe...@hotmail.com wrote:
>
>
>
>
>
>> On 11 Nov, 16:37, hradilv <hrad...@yahoo.com> wrote:
>
>>> On Nov 11, 10:27 am, rlaybe...@hotmail.com wrote:
>
>>>> Hi
>
>>>> I am interested in fitting a line of the form y=mx+c using regress or
>>>> linfit. I want the option of fixing the value of c at zero. Can I do
>>>> this in either of these 2 functions or would I need to use something
>>>> else?
>
>>>> Thanks
>
>>>> Russ
>
>>> Just write it yourself:
>
>>> mhat = total(x*y)/total(x*x)
>
>>> http://mallit.fr.umn.edu/fr5218/reg_refresh/origin.html
>
>> thanks. is that really true? this gives the best fit? great, that's
>> one problem solved. what about if I want to set the intercept to c1?
>
>> russ
>
> Transform the data?
>
> mhat = total(x*(y-c1))/total(x*x)- Hide quoted text -
>
> - Show quoted text -

thanks hradilv, you've saved me a few hours!

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[Message index]

		Re: linfit and regress questions By: rlayberry on Mon, 12 November 2007 02:02
		Re: linfit and regress questions By: Vince Hradil on Sun, 11 November 2007 08:49
		Re: linfit and regress questions By: rlayberry on Sun, 11 November 2007 08:42
		Re: linfit and regress questions By: Vince Hradil on Sun, 11 November 2007 08:37
		Re: linfit and regress questions By: Craig Markwardt on Mon, 12 November 2007 19:16

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