The positive square root of the sum of the squares of the deviations between the observations
and the mean of the series, divided by one less than the total number in the series.
The standard deviation
is the positive square root of the variance, a more fundamental statistical quantity.
PAC, 1994, 66, 595
(Nomenclature for the presentation of results of chemical analysis (IUPAC Recommendations
on page 599
PAC, 1990, 62, 2167
(Glossary of atmospheric chemistry terms (Recommendations 1990))
on page 2216