Function compute

compute(median: number, iqr: number): (value: number) => number
Calculates 'robust scaling' of a single value, x, based on provided mean and standard deviation.
```
const m = median(someData);
const i = interquartileRange(someData);
const fn = compute(m, i);

// Use normaliser function
fn(10);
```
If you want to calculate for a whole array, use array.
Parameters
- median: number
  Median of data
- iqr: number
  Interquartile range of data
Returns (value: number) => number
- Defined in normalise-robust.ts:21