Cointegration

A pair of stocks can wander individually while a specific combination of them holds steady — that combination, and whether it's real or a statistical accident, is what this tool tests.

Once a pair checks out, it gives you the spread to trade, the hedge ratio that makes it market-neutral, and a live reading of how stretched the spread is right now.

The Screener side skips the testing step and hands you a ranked shortlist of a stock's already-vetted partners, so you can scan for a tradeable setup instead of hunting for one pair at a time.

Only tickers inside the app's sample universe can be tested; anything else won't have the history needed to run the checks.

Test two tickers for a genuine, stable relationship, then read the current spread to decide whether it's stretched enough to trade.

Scan an anchor stock's pre-vetted partners for one that is both statistically sound and currently dislocated.

Choose how the hedge ratio is estimated and whether the tests allow for a trend, which changes both the spread you'd trade and the strength of the cointegration verdict.

Switch the hedge ratio between a fixed value and a Kalman filter that lets it drift, trading stability for responsiveness to a relationship that's slowly changing.

Run the test on the full history or a shorter rolling window, and scrub that window back through time to see whether the relationship has always held or only recently.

Turn on the structural-break test to catch a pair whose relationship shifted once and then re-stabilized — something the standard test alone can miss.

In the Screener, filter to only partners that already passed the vetting, and sort or re-axis the list by reversion speed, significance, or current dislocation.