Standard Deviations

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StandardDeviations(Vector, Periods, Standard Deviations, MA Type)
SDV(Vector, Periods, Standard Deviations, MA Type)


Overview
Standard Deviation is a common statistical calculation that measures volatility. Many technical indicators rely on standard deviations as part of their calculation.


Interpretation
Major highs and lows often accompany extreme volatility. High values of
standard deviations indicate that the price or indicator is more volatile than usual.

Recommended Parameters
Vector: CLOSE
Periods: 21
Standard Deviations: 2
MA Type: SIMPLE


Example
set SDV21 = SDV(CLOSE, 21, 2, SIMPLE)
set BUY = SDV21 > REF(SDV21, 10)
Evaluates to true when 21 period Standard Deviations are greater than 10 days ago.

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