StDevP
Returns the standard deviation of a population represented by a series of non-blank values in a field.
Format
StDevP ( field {; field...} )
Parameters
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 braces { } are optional.
Data type returned
number
Originated in version
6.0 or earlier
Description
Field can be any of the following:
- 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::field1;table::field2;...). You can include fields from different tables(table 1::field A;table 2::field B...).
Notes
- When a referenced field is a repeating field, the StDevP function returns the standard deviation of a population in the first repetition fields, then the standard deviation of a population in the second repetition fields, and so on.
Example 1
A portal displays the related values 5, 6, 7, and 8 in the field Scores. StDevP(table::Scores) returns 1.11803398....
Example 2
In the following examples:
- Field1 contains two repetitions with values of 1 and 2.
- Field2 contains four repetitions with values of 5, 6, 7, and 8.
- Field3 contains four repetitions with values of 6, 0, 4, and 4.
- Field4 contains one repetition with a value of 3.
StDevP(Field4) results in an error because the population standard deviation of a single number is not defined.
StDevP(Field2) returns 1.11803398... for a non-repeating field.
StDevP(Field1;Field2;Field3) returns 2.16024689..., 2.49443825..., 1.5, 2 for repeating fields.