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_observation`(observation, 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

classmethod from_observation(observation, bg_estimate)¶

Parameters:	observation : `DataStoreObservation` IACT data store observation bg_estimate : `BackgroundEstimate` Background estimate

classmethod stack(stats_list)¶

Stack (concatenate) list of ObservationStats.

Parameters:	stats_list : list List of `ObservationStats`
Returns:	total_stats : `ObservationStats` Statistics for stacked observation