Category
MultiBar Functions
Description
Statistical measure of the variance of a distribution of values
Syntax
StdDev(expr, count)
Parameters
expr  data series formula
count  lookback period
Notes
StdDev is calculated in the same way that Excel calculates the STDEV.P function, which is as if the set of count values is the entire population.
The specific formula used is shown below, in the "sdev" item:
This also illustrates how these statistical functions could be calculated in the Data Section of a script, though since they're provided builtin, there's no reason to do so.
This function supports ultrafast onepass calculation when used in the Data Section with a nonvariable count.
See also Skewness and Kurtosis.
