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User Guide

6.1.2
- 6.2
- 6.1

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stdev

The stdev analytic estimates the standard deviation based on a sample. The standard deviation is a measure of how widely values are dispersed from the average value, that is the mean.

Syntax

stdev(number1,[number2],...])

The following table describes the required and optional arguments:

Argument	Required Optional	Description
number1	Required	The first number argument corresponding to a sample of a population.
number2	Optional	A single array or a reference to an array instead of arguments separated by commas.

The following table provides the datatype for the parameters you can pass:

Parameter Input Options	Datatype
Event property	Text
Watchlist values	Text

Example

when 1 stockdeviation s with stdev(s.p1,s.p2,s.p3,s.p4) as result>2.73 then response with body=”${result}”

The following table describes the result for the event property value that you pass:

Event Property Value	Description	Result
p1 1.98 p2 2.45 p3 -3.56 p4 0	Returns the standard deviation of the set of numbers.	2.7329638978

Error Condition

The analytic does not run when there is a type mismatch, that is, when the values contain nonnumeric data. On type mismatch, the analytic returns an error, stops the rule evaluation, and writes the mismatch error to the log file.

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Table of Contents

User Guide

User Guide

stdev

stdev

Syntax

Error Condition