# Re: storing statistic results

From: David P. Huenemoerder <dph_at_email.domain.hidden>
Date: Wed, 14 Oct 2009 15:30:56 -0400
Hi Juan,

juan> I wonder if it is possible to store the results of a fit in
juan> a variable. I would like to save the number of free
juan> parameters, \chi^2, \chi^2_\nu in a file for easy access.

I think what you want are the optional arguments to fit_counts:

fit_counts

SYNOPSIS
search for best fit parameters

USAGE
s = fit_counts ([response_type][,&info_struct])

DESCRIPTION
By default, this function fits the current model to the counts
data by folding the model through the instrument response. If
no instrument response has been assigned, an ideal instrument
is assumed.  If no errors occurred during the fit, the return
status is zero, otherwise the return value is -1.

The two optional arguments may appear in any order.

The optional Struct_Type argument should provide the address of
a structure:

variable info_struct = struct {statistic, num_variable_params, num_bins}

On return, the struct fields contain the value of the chi^2
fit-statistic ( statistic), the number of variable fit
parameters ( num_variable_params) and the number of data bins (
num_bins).

...

If you want to put them into a file, you can use writecol().

-- Dave

David Huenemoerder  617-253-4283 (o); -253-8084 (f); http://space.mit.edu/home/dph
MIT Kavli Institute for Astrophysics and Space Research
70 Vassar St., NE80-6065,
Cambridge, MA  02139
[Admin. Asst.: Elaine Tirrell, 617-253-7480, egt_at_email.domain.hidden
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Received on Wed Oct 14 2009 - 15:32:44 EDT

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