The statistical standard deviation of a price series over N periods.
StdDev computes the statistical standard deviation of closing prices over n periods. High values indicate high volatility and uncertainty, low values indicate stability. It is used as a component in Bollinger Bands and as a standalone volatility indicator.
Formula:
StdDev = sqrt(SUM((Close - SMA(Close, n))^2, n) / n)
Parameter Type Default Range / Values Periodint 20 1-200
Trigger Direction Condition Description Level cross up 🟢 Buy The indicator value crossed the set level from below. The standard deviation value crosses the configurable Level from below. Level is set in the trigger parameters. Level cross down 🔴 Sell The indicator value crossed the set level from above. The standard deviation value crosses the Level from above. Level is set in the trigger parameters. Value above level by N 🟢 Buy The indicator value rose above the level by a set distance. The standard deviation value crosses the Level + Distance mark, moving upward. The distance delays entry until the level breakout is confirmed. Value below level by N 🔴 Sell The indicator value dropped below the level by a set distance. The standard deviation value crosses the Level − Distance mark, moving downward. Value rising 🟢 Buy The indicator value is rising relative to the previous bar. The standard deviation value on the current bar is higher than on the previous one — upward momentum. Value falling 🔴 Sell The indicator value is declining relative to the previous bar. The standard deviation value on the current bar is lower than on the previous one — downward momentum. Fires on every declining bar. Slope turns positive 🟢 Buy The indicator’s slope turned positive — an upward reversal. The standard deviation value changes its slope from descending to ascending — the indicator has stopped falling and started rising. Slope turns negative 🔴 Sell The indicator’s slope turned negative — a downward reversal. The standard deviation value changes its slope from ascending to descending — the indicator has stopped rising and started falling.
Parameter Type Default Range / Values Distance (Value above level by N, Value below level by N)float 0 0> Level (Value above level by N, Value below level by N, Level cross up, Level cross down)float 0
