04
The three numbers
- Up
- The probability that the stock makes a significant positive return over a short horizon (typically a few days to a week or two), given today’s analysis of the whole universe.
- Down
- The probability of a significant negative return over the same horizon, from the same analysis. It is scored on its own, not as one minus Up, and is the number to read for a short position.
- Move
- The probability of a significant move in either direction over the same horizon, regardless of which way.
Every probability is a statement about today’s setup. A stock that did not move as expected may carry a different probability tomorrow, because tomorrow’s universe is analysed afresh.
Each of the three is measured independently of the other two. They are not complementary and do not add up to 100%: a stock can score high on all three, or low on all three. Read together, they form a single confidence vector for a position rather than three separate opinions.