In measuring its Operational Risk VaR, a bank needs to pay attention when including external data in its internal loss collection. In principle, these data should be scaled consistently to the specific nature of the bank's risk, but this is not done by the majority of institutions with advanced...

Real operational loss data exhibit in some cases power laws on a wide part of the tail distributions, with sharp deviations far on the right suggesting they decrease to zero faster at infinity. Taking into account such deviations when modelling operational risk leads to great differences in VaR...