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Stats

class gammapy.stats.Stats(n_on, n_off, a_on, a_off)

Bases: object

Container for an on-off observation.

Parameters

n_onarray_like

Observed number of counts in the on region

n_offarray_like

Observed number of counts in the off region

a_onarray_like

Relative background exposure of the on region

a_offarray_like

Relative background exposure in the off region

Attributes Summary

alpha	Background exposure ratio (float).
background	Background estimate (float).
excess	Excess (float).

Attributes Documentation

alpha

Background exposure ratio (float).

$$\alpha = a_\mathrm{on} / a_\mathrm{off}$$

background

Background estimate (float).

$$\mu_\mathrm{bg} = \alpha\ n_\mathrm{off}$$

excess

Excess (float).

$$n_\mathrm{ex} = n_\mathrm{on} - \mu_\mathrm{bg}$$