Deciles are the 9 values that split a string into ten equal parts.

For internal or external benchmark of salary elements are used the following statistical elements:

D1  - First Decile - 10% of the values in the string are below, 90% of the values are above; also known as Percentile 10

D9 – Ninth Decile - 90% of the values in the string are below, 10% of the values are above; also known as Percentile 90