Guide
Reading historical analogs
A set of matches isn’t an answer - it’s evidence you have to read. Here’s how to read it well, and the traps that catch people.
Start with direction and spread
The first thing to look at is the directional split: of the matches found, how many rose, fell, or went roughly flat over their continuation window. But direction alone is half the story. A 70%-up result where the moves range from +1% to +60% is very different from a 70%-up result clustered tightly around +4%. Wide spread means low agreement; the analogs technically lean one way but they don’t really concur.
Respect the drawdown
Average return tells you where setups like this ended up; average drawdown tells you what they put you through to get there. Plenty of historically “up” setups first fell hard enough to stop out an impatient position. If the average drawdown is deep, a directional edge is only useful to you if your risk tolerance and position size can survive the path.
Weigh the sample size and match quality
Five loose matches are a curiosity; fifty close matches are evidence. This is what the confidence score blends - sample count, directional agreement, outcome tightness, and how similar the matches actually are. Treat low confidence as the tool telling you, honestly, that history doesn’t have a strong opinion here.
Traps to avoid
- Confirmation shopping. Don’t reframe the window repeatedly until the matches agree with what you already wanted to do. Frame it honestly once.
- Ignoring regime. A calm-market analog and a crisis-market analog can have the same shape and totally different meaning. Glance at the market context shown with each match.
- Treating odds as certainty. 75% up means one in four similar setups did not. Plan for the quarter that doesn’t cooperate.
- Over-fitting the window. An ultra-tight window finds “perfect” matches that are really just noise. See framing a pattern window.
Putting it together
A good read sounds like: “Forty close matches, 68% up, median +5%, but average drawdown −7% and high confidence - a real lean, with real heat along the way.” That’s a sentence you can actually make a decision against. Vague optimism it is not.