“…The current paper will focus essentially on the formal characterization, the properties and the implementation of the LAD estimator and some of its variants for robust regression, hybrid system identification and resilient state estimation. The robustness properties of the LAD estimator make it applicable to hybrid system identification 21,22,23,24 , subspace clustering 25,26 and secure state estimation 27,28,29,30,31,32 .…”