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lib/dynamics/ghla/Ghla.md

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 # GHLA: Gann High-Low Activator
 
+| Property         | Value                            |
+| ---------------- | -------------------------------- |
+| **Category**     | Dynamic                        |
+| **Inputs**       | OHLCV bar (TBar)                          |
+| **Parameters**   | `period` (default 13)                      |
+| **Outputs**      | Single series (Ghla)                       |
+| **Output range** | Varies (see docs)                     |
+| **Warmup**       | `period` bars                          |
+
+### TL;DR
+
+- The Gann High-Low Activator (GHLA) is a trend-following stop/reversal indicator that alternates between the Simple Moving Average of Highs and the ...
+- Parameterized by `period` (default 13).
+- Output range: Varies (see docs).
+- Requires `period` bars of warmup before first valid output (IsHot = true).
+- Validated against TA-Lib, Skender, and Tulip reference implementations where available.
+
 > "The simplest indicators are the hardest to argue with. Two averages, one rule, and the market tells you which side of the fence to stand on."
 
 The Gann High-Low Activator (GHLA) is a trend-following stop/reversal indicator that alternates between the Simple Moving Average of Highs and the Simple Moving Average of Lows based on a three-state crossover rule. Developed by Robert Krausz and published in *Technical Analysis of Stocks & Commodities* (February 1998), the indicator produces a single trailing line: SMA(Low) during uptrends (acting as dynamic support) and SMA(High) during downtrends (acting as dynamic resistance). The flip between states occurs only when price closes decisively beyond the opposing SMA, creating a hysteresis zone that filters minor whipsaws. With a default period of 3 bars, GHLA responds aggressively to trend changes while requiring just $O(N)$ additions and one comparison per bar.