SpectrumStats¶

class gammapy.spectrum.SpectrumStats(**kwargs)[source]¶

Spectrum stats.

Extends ObservationStats with spectrum specific information (energy bin info at the moment).

Attributes Summary

`alpha`	Alpha (on / off exposure ratio)
`background`	Background estimate (float)
`excess`	Excess (float)
`sigma`	Li-Ma significance for observation statistics (`float`).

Methods Summary

`from_obs`(obs, bg_estimate)	Create from `DataStoreObservation`.
`stack`(stats_list)	Stack (concatenate) list of `ObservationStats`.
`to_dict`()	TODO: document

Attributes Documentation

alpha¶

Alpha (on / off exposure ratio)

Override member function from Stats to take into account weighted alpha by number of Off events

background¶: Background estimate (float)

\[\mu_\mathrm{bg} = \alpha\ n_\mathrm{off}\]

excess¶: Excess (float)

\[n_\mathrm{ex} = n_\mathrm{on} - \mu_\mathrm{bg}\]

Methods Documentation

from_obs(obs, bg_estimate)¶

Create from DataStoreObservation.

Parameters:

obs : DataStoreObservation

IACT data store observation

bg_estimate : BackgroundEstimate

Background estimate

stack(stats_list)¶

Stack (concatenate) list of ObservationStats.

Parameters:

stats_list : list

List of ObservationStats

Returns:

total_stats : ObservationStats

Statistics for stacked observation