Echo Radar

What Radar scans

Radar runs one completed scan per market per day: the S&P 500 constituents on the stock side, and the top 25 cryptocurrencies by market capitalisation on the crypto side. Each chart’s recent daily window is matched against the Chart Echo historical archive, and the matches — not a model’s opinion — decide whether that chart shows a bullish lean, a bearish lean, or nothing worth ranking.

How a Radar setup is built

A setup only appears once a chart has enough close historical precedent to say something measurable. For every candidate, Radar records:

• Confidence — how strongly the precedent set agrees on one direction. Higher confidence means the closest analogs mostly resolved the same way, not that the move is larger or more certain to repeat.
• Analogs — how many historical windows matched closely enough to count. A lean drawn from a handful of precedents is weaker evidence than the same lean drawn from dozens.
• Up / down split — the share of those precedents that resolved higher versus lower. The split is published even when it is close, because a genuinely divided archive is a real result.
• Median continuation — the middle outcome across the matched set, so a single dramatic precedent cannot drag the figure.
• Best analog — the single closest historical window, and how closely it matched, so you can inspect the specific precedent behind the ranking.

Why some days show fewer setups

Radar only publishes scans that complete and pass a coverage threshold. If a day’s run did not cover enough of the universe, that run is withheld rather than shown partially — a thin scan would rank the symbols that happened to succeed, not the strongest setups in the market. Quiet days with few qualifying setups are also normal: when little of the market closely resembles its own history, there is little for Radar to report.

What Radar is not

Radar is not a signal service and its rankings are not investment recommendations. A historical lean is a base rate drawn from what similar-looking charts did afterwards — regimes shift, and any individual case can be the exception. Radar is built to show you the precedent and its disagreement so you can judge it, not to tell you what to buy. The method and its limits are documented in Methodology & limits.

Radar and the Echo Index

Radar is the daily, symbol-level view. The Echo Index is the free weekly summary of the same underlying archive — one number for how much of the liquid market is currently rhyming bullish, bearish, or split. Radar’s ranked daily setups, filtering and portfolio tracking are Premium features; the Echo Index is public.