Re: errors on fit parameters in isis

On Fri, Apr 25, 2003 at 14:57 -0400, Saku Vrtilek wrote:
> 
> How do I get errors on fit parameters in ISIS?  When I
> do a list_par; I get the value and min and max range: no
> errors?
> 

You can use the 'conf' function to compute single parameter
confidence limits. For example, to get 90% confidence limits on
a Gaussian width, you could do

  (sigma_lo, sigma_hi) = conf ("gauss(1).sigma");

You can also generate 2D confidence contours using the functions

  conf_grid
  conf_map_counts   conf_map_flux

which of the last two are used depends on whether you're fitting
counts or fitting flux-corrected data.


-John

-- 
John C. Houck                       MIT Center for Space Research
NE80-6005: 617-253-3849                   77 Massachusetts Avenue
42:21:55.105N, 71:05:28.122W             Cambridge, MA 02139-4307
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