Variance

Variance(Number a[ ])
Variance(Currency a[ ])
Variance(DBField field)
Variance(DBField field, String groupby)

This function computes the variance of all the values referred to by the argument.

Parameters

a - A Number array.
field - Values of DBField or formula field.
groupby - A constant string which indicates the DBField, formula or parameter grouped by.

Return value

Returns a Number type value.

Examples

Number x = Variance([1.0, 2.0, 3.0, 4.5, 45.0, 67.0])
Number x[6] = [1.0, 2.0, 3.0, 4.5, 45.0, 67.0]; Number y = Variance(x)
Number x = Variance(@dbfield)
Number x = Variance(@formula)
Number x = Variance(@dbfield, @dbfield_groupby)
Number x = Variance(@dbfield, @formula_groupby)
Number x = Variance(@dbfield, @parameter)

Note: If a field_variable is assigned to a variable, for example x, the variable x will lose the characteristic of representing a group of values. So, the following formula will be treated as incorrect.

Number x = @dbfield; Number y = Variance(x); // system will prompt you that there is no such kind of function.