Synopsis
Set the statistical errors
Syntax
set_staterror([id], val, [fractional,] [bkg_id])
Description
The set_staterror command sets the statistical errors for a dataset. The error value may be an array or a single value to be repeated for every bin. Setting the fractional argument uses the scalar value as the fractional portion of the dependent array as the errors.
- id - the id of the dataset to use; if not given, uses the default dataset id (id=1 by default, see "ahelp get_default_id")
- val - array or scalar error values
- fractional - use a fractional portion of the dependent array as the error? default=False . May be set to True , only if the "val" is a scalar.
- bkg_id - the id of the background, if setting the background value; default=None
Sherpa reads in the grouping flags from file and turns on grouping by default, if possible. The errors will be grouped if grouping is on.
Examples
Example 1
sherpa> set_staterror([0.040, 0.039, 0.041, ...])
Set the staterrors to an array of error values.
Example 2
sherpa> set_staterror(2, 0.04)
Set the statistical errors for dataset id=2 to 0.04 for all bins.
Example 3
sherpa> set_staterror(0.05, fractional=True)
Use a fractional portion (0.05) of the dependent array as the errors for the default dataset.
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_syserror
- filtering
- set_filter
- 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
- set_prior, set_sampler, set_sampler_opt, set_stat
- utilities
- set_analysis, set_default_id
- visualization
- image_setregion