cash

gammapy.stats.cash(n_on, mu_on)[source]

Cash statistic, for Poisson data.

The Cash statistic is defined as:

C=2(μonnonlogμon)

and C=0 where μ<=0. For more information see Fit statistics

Parameters
n_onarray_like

Observed counts

mu_onarray_like

Expected counts

Returns
statndarray

Statistic per bin

References