Breadth summation levels as a short-term signal filter

A trigger is not a climate

A short-term setup is a trigger. It asks whether a repeatable chart condition is present right now. Market-breadth asks a slower question: whether participation across advancing and declining issues supports acting on that trigger at all.

Editorial reading: a calibrated long-horizon breadth-accumulation band does not pick entries. It decides whether any shorter-term signal is even allowed to fire. That is regime-dependence. The same setup is only worth considering when the broader participation climate is supportive.

How the breadth-summation is built

The historical series began with a daily breadth-oscillator: the spread between a faster and a slower exponential average of net advances. That oscillator was the daily increment of a breadth-summation, a running total whose level, once calibrated, is read as a persistent climate score.

The increment used ratio-adjusted-net-advances, meaning net advances scaled by advancing plus declining issues. The ratio form was used so a growing exchange listing would not distort longer-horizon comparisons.

Why the printed level needs calibration

Because the series is a running sum, its printed level depends on the start date and on any missing or erroneous observations along the path. Without an adjustment, the same climate would print as a different number if the series began on a different day.

A zero-level-calibration that uses only the current faster and slower exponential averages was introduced so the same index level can be reconstructed for any historical date. After that starting-point adjustment, the same numerical bands stay comparable no matter when the series begins.

The summation as a permission-switch

The archive treated the calibrated level as a trend-filter. Exposure was defined as long the related composite while the summation stayed above a chosen level, and flat once it crossed back below. Unused cash was assigned money-market interest while the rule was flat. A later multi-year chart of the same series marked zero and a higher elevated band as the levels above which the composite was generally rising, and overlaid a longer average of price as a second filter.

The summation level was framed as a climate gate for shorter-term tools: slower satellite timing and fewer trades when the reading is elevated, and avoidance of overexposure when it is below zero.

Editorial reading: that gate is a permission-switch. It is a higher-level on or off condition that licenses or vetoes shorter-term timing tools. It does not replace those tools, and it does not, by itself, say when to enter.