@Frank Apisa,
Frank Apisa wrote: Yeah…but I suggest neither you nor I have enough facts to make that kind of calculation.
It is not that complex. Suppose you believe in the abiogenesis and you have at your disposal five plausible hypothesis as its cause: 1) lightning, 2) UV radiation, 3) metabolism first approach, 4) heterogeneous and 5) extra-terrestrial origin of life.
Suppose you believe in them all ... equally. So you have:
- probability for lightning (to be the cause of the abiogenesis) - 20%
- probability for UV radiation - 20%
- metabolism first approach - 20%
- heterogeneous - 20%, and
- extra-terrestrial origin - 20%
Now suppose you believe in these cases on a priority list. You believe that some of the causes could be more probable than some others.
1. (top priority) - UV radiation
2. metabolism first approach
3. lightning
4. extra-terrestrial origin
5. heterogenesis
Now you put some weight factors to express your belief:
1. probability for UV radiation - 30%
2. metabolism first approach - 25%
3. lightning - 20%
4. extra-terrestrial origin - 15%
5. heterogenesis - 10%
Actually the values don't matter - the most important is to distinguish them in order to reflect your beliefs that they are arranged in a priority list.
Now suppose that the probability for the abiogenesis to be the cause of life is 10^-2. We have then 0.2 x 10^-2 = 2.10^-3 For probabilities less than 10^-3 the number is insignificant ... and you announce only the order: the probability is ten to the power of minus three (in this case.)
So it is not so much difficult to assign and to calculate probability values ... as you are trying to present it.