Calculates the standard deviation for a field over a set of events. The result is returned in a field named _stddev

asstringfalse_stddevName of output field.
fieldstringtrue Field to extract a number from and calculate standard deviation over. [a]

[a] If an argument name is not given, field is the default argument.

stdDev() Examples

Find the standard deviation of bytes send in http responses

stdDevBytes := stdDev(field=bytes_sent)