Filemaker Pro 8.5 Educational Maintenance T3 TJ083LL/A User Manual

•

several fields in the first matching record specified by 
(table::field1;table::field2;...). You can include fields from different 

 (table 1::field A;table 2::field B...).

A portal displays the related values 5, 6, 7, and 8 in Scores.
Variance(table::Scores) returns 

.

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 

, 

, 

 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: 

Class 2: 

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(field{;field...})

field - any 

, 

; or an 

that returns a field, repeating field, or set of non-repeating fields.
Parameters in curly braces { } are optional.

number

Variance

x

1

2

x

2

2

… x

n

2

+

+

+

n 1

–

------------------------------------------

x

1

x

2

… x

n

+

+

+

(

)

2

n n 1

–

(

)

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–

=