[SciPy-User] Scipy fitting
Thu Mar 1 10:55:54 CST 2012
On Thu, Mar 1, 2012 at 10:54 AM, Pierre Barthelemy <firstname.lastname@example.org> wrote:
> Dear all,
> i am writing a program for data analysis. One of the functions of this
> program gives the possibility to fit the functions. I therefore use the
> recipe described in : http://www.scipy.org/Cookbook/FittingData under the
> section "Simplifying the syntax". This recipe make use of the
> function: scipy.optimize.leastsq.
> One thing that i would like to know is how can i get the error on the
> parameters ? From what i understood from the "Cookbook" page, and from the
> scipy manual
> the second argument returned by the leastsq function gives access to these
you are taking the sqrt twice numpy.std takes the sqrt of the variance
and then you take it again.
once is enough if I read the snippet correctly, you might also add a
ddof correction to std
(y - function(x)) should have also mean zero if a constant is included
> The param_errors that i get in this case are extremely small. Much smaller
> than what i expected, and much smaller than what i can get fitting the
> function with matlab. So i guess i made an error here.
> Can someone tell me how i should do to retrieve the parameter errors ?
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