stddev - Function

Calculate the standard deviation of a set of numbers

Synopsis
stddev(dots, assumed_mean)

Description
This is a more convenient front end to moments. The standard deviation is the square root of the variance (variance()).

You can tell it to assume a mean rather than calculating it if desired. NB: The assumed_mean argument must be explicitly indicated as in the example below ('assumed_mean=0', not just '0'); otherwise, the value specified will simply be included in the list of samples.

Arguments

dots	The numbers to perform statistics on
assumed_mean	If numeric, assume the mean is this value rather than calculating it; if used, parameter name must be explicitly specified
	Allowed:	numeric scalar
	Default:	[=]

Returns
the stddev

Example

      - include "statistics.g"
      - stddev(1:100)
      29.0115 
      - stddev(1:100,assumed_mean=50)  # instead of 50.5
      29.0158

See Also
moments

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	Package	utility
	Module	mathematics