RangeKurtosis - Script and chart function
                RangeKurtosis() returns the value that corresponds to the kurtosis of a range of numbers.
Syntax:
RangeKurtosis(first_expr[, Expression])
Return data type: numeric
Arguments:
The arguments of this function may contain inter-record functions which in themselves return a list of values.
| Argument | Description | 
|---|---|
| first_expr | The expression or field containing the data to be measured. | 
| Expression | Optional expressions or fields containing the range of data to be measured. | 
Limitations:
If no numeric value is found, NULL is returned.
Examples and results:
| Examples | Results | 
|---|---|
| RangeKurtosis (1,2,4,7) | Returns -0.28571428571429 |