SDEV
Returns a number that represents the standard deviation of a parents child records.
SDEV ( <field_name> [, <filter_query>] )
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field_name: The name of the field to use in the calculation.
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filter_query: A query string representing the domain of records to include.
Example: for each customer calculate the standard deviation for all purchases with a value > 38.
SDEV([TRANSACTION.VALUE],[TRANSACTION.VALUE] > 38)