Determine necessary and sufficient conditions for a well-defined riskyr scenario

[hneth]

We know that providing 3 essential probabilities (prev, sens, spec) OR providing 4 essential frequencies (hi, mi, fa, cr) fully specify a scenario. However, which combination of (any) probabilities and frequencies is necessary or sufficient?

(Looking at a network diagram should tell us which parts are independent from vs. dependent on each other. Interestingly, probabilities allow abstracting from frequencies, but not vice versa...)