StdDev (Function)

The StdDev function calculates a standard deviation of a population of values.

StdDev(Price, Length)

A numeric value containing the current standard deviation.

Name	Type	Description
Price	Numeric	Specifies which bar value (price, function, or formula) to be considered.
Length	Numeric	Sets the number of bars to be considered.

To find the standard deviation, first find the variance and then take its square root:

StdDev = $image\standarddev_formula.gif$

…where

N is the number of elements

D is the individual elements in the sample

M is the sample mean

Assigns to Value1 the standard deviation of Close over 10 bars.

Value1 = StdDev(Close, 10);