Functions Reference

Chapter 2
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Aggregate functions 23
Examples
A portal displays the related values 5, 6, 7, and 8 in Scores.
Variance(table::Scores) returns 1.66666666....
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.
Variance(Field4) results in an error since the variance of a single value is not
defined.
Variance(Field1;Field2;Field3) returns 7, 9.33333333..., 4.5, 8 if the calculation
is a repeating field.
Student example:
Two classes of students take an exam. Class 1 has scores of 70, 71, 70, 74, 75, 73, 72,
and Class 2 has scores of 55, 80, 75, 40, 65, 50, 95. The variance for each class is:
Class 1: 3.80952380...
Class 2: 361.90476190...
The variance for Class 1 is much lower than the variance for Class 2, because the scores
for Class 2 are more spread out.
VarianceP
Format
VarianceP(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