Returns the rank of a value in a data set as a percentage (0..1, exclusive) of the data set.
| Name | Type | Description |
| arg1 | Array.<number> | ApiRange | The array or range of data with numeric values that defines relative standing. |
| arg2 | number | The value for which the rank will be returned. |
| arg3 | number | An optional value that identifies the number of significant digits for the returned percentage, three digits if omitted (0.xxx%). |