Synopsis

Calculates the standard deviation of values in a specified column of the search query results.

Syntax

stdev [COLUMN_NAME]

Required Arguments

COLUMN_NAME

Syntax: <character string>

Description: The name of a column header that has numeric values

Optional Arguments

None

Description

Shows how much variation or dispersion from the average exists calculated on values from a specific log column. A low standard deviation indicates that the data points tend to be very close to the mean (also called expected value); a high standard deviation indicates that the data points are spread out over a large range of values.

Examples

Example 1:  

* in log.access | stdev Bytes-Sent 

Calculates the standard deviation of the values under the column Bytes-Sent in the access log