Comment by nvme0n1p1

5 hours ago

If a stock market observation has no predictive power, then it's worthless.

I look forward to your weather report too: "It's always sunny outside until one day it starts raining. Every time."

> I look forward to your weather report too: "It's always sunny outside until one day it starts raining. Every time."

I once ran across the comment that if you simply predict tomorrow's weather will be the same as today's you'd be correct 80% of the time. Not sure how true that is (can't find the source).

Allegedly momentum investing does pretty well:

* https://en.wikipedia.org/wiki/Momentum_investing

(I'm more of an index guy myself.)

ye, the stock market isn't magic, it's just a collection of what people think. and people can be very wrong in a big way.

Not at all, if someone tells me that "This stock is historically likely to regress to and beyond the mean," it's information I can use to evaluate my risk tolerance. Just because a piece of information doesn't let you time the market like a psychic doesn't make it worthless, it's just not what you were looking for.