9/5 is terrible accuracy.

In the investment industry, 9/5 is excellent.

How do you mean? Looks like an equivalent of a coin flip to me.

I'm not super knowledgeable in this area, but one possibility is that the "9 of the 5" only gives the number of times that it predicted that there would be a recession. There could be many more times that it accurately predicted that there would not be a recession.

If you flipped a coin every day in order to determine whether or not a recession would start, you'd be wrong 99% of the time.

How do you figure? Wouldn't you be wrong 50% of the time?

it's approximately 50/50. You're almost just as good with a coinflip.

A coinflip would be a 3650/5 or so.

A biased coinflip that gives 5 signals would be 5/0.