What is the difference between probability and proportion?

I have hesitated to wade into this discussion, but because it seems to have gotten sidetracked over a trivial issue concerning how to express numbers, maybe it's worthwhile refocusing it. A point of departure for your consideration is this: A probability is a hypothetical property. read more

Probability involves random variables, while proportion is something more general, that could involve randomnes. Probability tells you the likelihood of something happening, while proportion is just the comparison of (measurable) quantities. read more

Proportions (in the sense intended in the question) lie between 0 and 1, the proportion of times a sure event occurs is 1, and the proportion of time A or B occurs is the sum of the proportions if the events are mutually exclusive. read more