olemus
kvantitatiivne riskitegur:
ohuagendi tõenäoline toimesagedus määratud perioodil
=
the probable frequency, within a given timeframe, a threat agent can inflict harm

ülevaateid
https://image.slidesharecdn.com/introductiontofair-170901100806/95/introduction-to-fair-factor-analysis-of-information-risk-26-1024.jpg

https://medium.com/@marioplatt/quantitative-risk-management-with-fair-evaluate-loss-event-frequency-395d31eba908

https://pubs.opengroup.org/onlinepubs/9699919899/toc.pdf