Functions Reference

Chapter 2
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Aggregate functions 17
StDev
Format
StDev(field{;field...})
Parameter
field - any related field, repeating field, or set of non-repeating fields; or an expression
that returns a field, repeating field, or set of non-repeating fields.
Parameters in curly braces { } are optional.
Data type returned
number
Description
Returns the standard deviation of the sample represented by a series of non-blank values
in:
• a repeating field (repeatingField).
• a field in matching related records specified by (table::field), whether or not
these records appear in a portal.
• several non-repeating fields in a record (field1;field2;field3).
• corresponding repetitions of repeating fields in a record
(repeatingField1;repeatingField2;repeatingField3), if the result is
returned in a repeating field with at least the same number of repeats.
• several fields in the first matching record specified by (table 1::field A,
table 2::field B,...). You can name a different table for each field (table
1::field A;table 2::field B...).
ΣτΔεϖ
ξ
1
2
ξ
2
2
…ξ
ν
2
+++
ν1–
------------------------------------------
ξ
1
ξ
2
…ξ
ν
+++()
2
νν 1–()
-------------------------------------------------–=