Functions Reference

Aggregate functions
F
ILEMAKER FUNCTIONS REFERENCE 37
Examples
A portal displays the related values 5, 6, 7, and 8 in Scores.
VarianceP(table::Scores) returns 1.25.
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.
VarianceP(Field4) results in an error since the variance of a single value is not defined.
VarianceP(Field1;Field2;Field3) returns 4.66666666..., 6.22222222..., 2.25, 4 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 population variance for each class is:
Class 1: 3.26530612...
Class 2: 310.20408163...
The population variance for Class 1 is much lower than the population variance for Class 2
because the scores for Class 1 are more tightly clustered.