set_stat

Synopsis

Set the statistical method

set_stat( stat )

Description

The set_stat command sets the statistical method to be used in fitting.

• stat - the statistical method

Available statistics are returned by the list_stats command ("ahelp list_stats"). There is a help file for each statistical method, e.g. ("ahelp chi2constvar").

Example 1

sherpa> set_stat( "chi2modvar" )

Set the statistic to "chi2modvar", chi^2 with model amplitude variance.

Example 2

sherpa> set_stat( "cash" )

Set the statistic to "cash", a maximum likelihood function.

Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.

See Also

confidence

set_conf_opt, set_covar_opt, set_proj_opt

data

set_areascal, set_arf, set_backscal, set_bkg, set_coord, set_counts, set_data, set_exposure, set_grouping, set_quality, set_rmf, set_staterror, set_syserror

filtering

set_filter

info

list_stats

methods

set_iter_method, set_iter_method_opt, set_method, set_method_opt

modeling

get_par, set_bkg_model, set_full_model, set_par, set_pileup_model, set_source, set_xsabund, set_xscosmo, set_xsxsect, set_xsxset

statistics

cash, chi2constvar, chi2datavar, chi2gehrels, chi2modvar, chi2xspecvar, chisquare, cstat, get_prior, leastsq, list_priors, set_prior, set_sampler, set_sampler_opt

utilities

set_analysis, set_default_id

visualization

image_setregion