li_ma_significance
- pyirf.statistics.li_ma_significance(n_on, n_off, alpha=0.2)[source]
Calculate the Li & Ma significance.
Formula (17) in https://doi.org/10.1086/161295
This functions returns 0 significance when n_on < alpha * n_off instead of the negative sensitivities that would result from naively evaluating the formula.
- Parameters:
- n_on: integer or array like
Number of events for the on observations
- n_off: integer or array like
Number of events for the off observations
- alpha: float
Ratio between the on region and the off region size or obstime.
- Returns:
- s_lima: float or array
The calculated significance