Stats¶

class gammapy.stats.Stats(n_on, n_off, a_on, a_off)[source]¶

Container for an on-off observation.

Parameters:	n_on : array_like Observed number of counts in the on region n_off : array_like Observed number of counts in the off region a_on : array_like Relative background exposure of the on region a_off : array_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)

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