## Wikipedia - Scarto quadratico medio deviation, $$d$$

https://doi.org/10.1351/goldbook.D01650
The difference between an observed value and the arithmetic mean of the set to which it belongs. It can be calculated by the formula:
Sources:
Orange Book, 2nd ed., p. 4 [Terms]
PAC, 1994, 66, 595. (Nomenclature for the presentation of results of chemical analysis (IUPAC Recommendations 1994)) on page 599 [Terms] [Paper]