▁that ▁describes ▁the ▁loss ▁amount ▁of ▁a ▁single ▁loss ▁event . ▁The ▁frequency ▁and ▁sever ity ▁distributions ▁are ▁assumed ▁to ▁be ▁independent . ▁The ▁convolution ▁of ▁these ▁two ▁distributions ▁then ▁give ▁rise ▁to ▁the ▁( ann ual ) ▁loss ▁distribution . ▁ ▁See ▁also ▁Bas el ▁II ▁Basic ▁indicator ▁approach ▁Oper ational ▁risk ▁Standard ized ▁approach ▁( oper ational ▁risk ) ▁ ▁References ▁ ▁B IS ▁publications ▁http :// www . bis . org / pub l / bc bs ca . htm ▁Bas el ▁II : ▁Re vised ▁international ▁capital ▁framework ▁( BC BS ) ▁http :// www . bis . org / pub l / bc bs 1 0 7 . htm ▁Bas el ▁II : ▁International ▁Con ver gence ▁of ▁Capital ▁Me asure ment ▁and ▁Capital ▁Stand ards : ▁a ▁Re vised ▁Framework ▁( BC BS ) ▁http :// www . bis . org / pub l / bc bs 1 1 8 . htm ▁Bas el ▁II : ▁International ▁Con ver gence ▁of ▁Capital ▁Me asure ment ▁and ▁Capital ▁Stand ards : ▁a ▁Re vised ▁Framework ▁( BC BS ) ▁( Nov ember ▁ 2 0 0 5 ▁Re vision ) ▁http :// www . bis . org / pub l / bc bs 1 2 8 . pdf ▁Bas el ▁II : ▁International ▁Con ver gence ▁of ▁Capital ▁Me asure ment ▁and ▁Capital ▁Stand ards : ▁a ▁Re vised ▁Framework , ▁Com pre h ensive ▁Version ▁( BC BS ) ▁( J une ▁ 2 0 0 6