StdDev

StdDev(a[ ])
StdDev(field)
StdDev(field, groupby)

This function computes the standard deviation of 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 value.

Examples

Number x = StdDev([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 = StdDev( x)
Number x = StdDev(@dbfield)
Number x = StdDev(@formula)
Number x = StdDev(@dbfield, @dbfield1)
Number x = StdDev(@dbfield, @formula_groupby)
Number x = StdDev(@dbfield, @parameter)

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

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