trader_stddev(3) php man page | unix.com

TRADER_STDDEV(3)							 1							  TRADER_STDDEV(3)

trader_stddev - Standard Deviation

SYNOPSIS
       array trader_stddev (array  $real, [integer  $timePeriod], [float  $nbDev])

DESCRIPTION
PARAMETERS
	      o $real
		- Array of real values.

	      o $timePeriod
		- Number of period. Valid range from 2 to 100000.

	      o $nbDev
		-

RETURN VALUES
       Returns an array with calculated data or false on failure.

PHP Documentation Group 													  TRADER_STDDEV(3)