Page
|
|
|
Next Page |
|
| Contents > Functions reference (alphabetical list) > Aggregate functions > VarianceP function |
|
|
| VarianceP function |
| 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 |
| Description |
 |
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...). |
| 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. |
| Related topics |
|
Functions reference (category list) |
|
Functions reference (alphabetical list) |
|
About formulas |
|
About functions |
|
Defining calculation fields |
|
Using operators in formulas |
|
|
| Contents > Functions reference (alphabetical list) > Aggregate functions > VarianceP function |
|
|
Next Page |
|