Could someone help me out? I have probabilities for events A and B. I am trying to figure out how to calculate the probability of A or B occurring, where A and B are disjoint. You could be in event A or B or neither.

You just add them right?

@StephanKolassa Thanks, I appreciate all the advice! And the picture is indeed a nice touch!

Forecasting for supply chains is a good example of the sort of "obviously practically useful, but also probably rather more interesting than most of what I do now" stuff that I would like to explore the possibilities of.

Thanks also for the hint re LSE. I see their econometrics degrees are charged at approximately "new luxury car" rates, rather than the "reasonably new second-hand car" that a lot of other (even quite prestigious) UK universities seem to charge, but since my major cost would be loss of earnings, this isn't necessarily a killer problem.

I am currently in the throes of finishing off a 2nd undergrad degree examined by their external unit (I think they brand it now as "London International") and I've enjoyed how technical it is. I suspect their MSc would be a similar flavour, which would be attractive to me.

Having said that, the price tag did make me wonder if there might be better value for money to be had on the Continent!

@Hack-R I was going to say "this isn't the kind of thing we usually have as a chat topic - have you tried searching our site?" Except I just did that, and found that at an introductory level, what the search results throw up (for a variety of reasonable search terms) probably isn't terribly helpful. Don't know if that is a function of our site content, the search engine, or my searching skills...

But yes, see e.g. these rather nice notes from Penn State.