stddev - Calculate standard deviation
Computes the standard deviation of a numerical expression in the group.
Syntax
Arguments
Name | Type | Required | Description |
---|---|---|---|
expression | number | true | The expression whose standard deviation we seek |
Example - Calculate standard deviation of API using trace Data
Traces always come with an associated field duration
as part of their metadata. This value is a number
and understanding its standard deviation is powerful for understanding the normal variance of API performance.
Example - Calculate standard deviation of HTTP byte responses for request profiling
Understanding the normal variance of your HTTP response sizes will give a clear metric for indicating when HTTP responses are non-standard. Non-standard HTTP response volumes can be a sign of data exfiltration.
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