Synopsis
Display the statistic values for the current models.
Syntax
calc_stat_info()
Description
Displays the statistic value for each data set, and the combined fit, using the current set of models, parameters, and ranges. The output is printed to stdout, and so is intended for use in interactive analysis. The `get_stat_info` function returns the same information but as an array of Python structures.
Example
>>> calc_stat_info()
Notes
If a fit to a particular data set has not been made, or values - such as parameter settings, the noticed data range, or choice of statistic - have been changed since the last fit, then the results for that data set may not be meaningful and will therefore bias the results for the simultaneous results.
The information returned by `calc_stat_info` includes:
| Item | Definition |
|---|---|
| Dataset | The dataset identifier (or identifiers). |
| Statistic | The name of the statistic used to calculate the results. |
| Fit statistic value | The current fit statistic value. |
| Data points | The number of bins used in the fit. |
| Degrees of freedom | The number of bins minus the number of thawed parameters. |
Some fields are only returned for a subset of statistics:
| Item | Definition |
|---|---|
| Probability (Q-value) | A measure of the probability that one would observe the reduced statistic value, or a larger value, if the assumed model is true and the best-fit model parameters are the true parameter values. |
| Reduced statistic | The fit statistic value divided by the number of degrees of freedom. |
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.
See Also
- confidence
- get_conf, get_conf_results, get_covar, get_covar_opt, get_covar_results, get_covariance_results, get_int_proj, get_int_unc, get_proj, get_proj_opt, get_proj_results, get_projection_results, get_reg_proj, get_reg_unc
- contrib
- get_chart_spectrum, get_marx_spectrum
- data
- get_areascal, get_arf, get_arf_plot, get_axes, get_backscal, get_bkg, get_bkg_arf, get_bkg_chisqr_plot, get_bkg_delchi_plot, get_bkg_fit_plot, get_bkg_model, get_bkg_model_plot, get_bkg_plot, get_bkg_ratio_plot, get_bkg_resid_plot, get_bkg_rmf, get_bkg_scale, get_bkg_source, get_bkg_source_plot, get_coord, get_counts, get_data, get_data_contour, get_data_contour_prefs, get_data_image, get_data_plot, get_data_plot_prefs, get_dep, get_dims, get_error, get_exposure, get_grouping, get_indep, get_quality, get_rmf, get_specresp, get_staterror, get_syserror
- filtering
- get_filter
- fitting
- get_stat_info
- info
- get_default_id, list_stats
- methods
- get_draws, get_iter_method_name, get_iter_method_opt, get_method, get_method_name, get_method_opt
- modeling
- get_model, get_model_component, get_model_component_image, get_model_component_plot, get_model_plot, get_num_par, get_num_par_frozen, get_num_par_thawed, get_order_plot, get_par, get_pileup_model, get_response, get_source, get_source_component_image, get_source_component_plot, get_source_contour, get_source_image, get_source_plot, image_source
- plotting
- get_split_plot
- psfs
- get_psf, get_psf_contour, get_psf_image, get_psf_plot
- statistics
- get_chisqr_plot, get_delchi_plot, get_prior, get_sampler, get_stat, get_stat_name
- utilities
- calc_stat, get_analysis, get_rate
- visualization
- image_getregion