XMM-Newton Science Analysis System
ommosaic (ommosaic-2.11) [xmmsas_20230412_1735-21.0.0]
The MAD (median-absolute-deviation) test works as follows:
- Compute the median value of the data values
- For each data value compute its absolute deviation from the median
- Compute the median of all the absolute deviations (the MAD value)
- choose a value for nsigma
- For each data value divide its computed deviation by the MAD value
- If this value exceeds nsigma conclude that this is a deviant point
XMM-Newton SOC -- 2023-04-16