standard deviation (SD)
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Introduction
[Sum (Xi - Xave)^2 / (N - 1)]^1/2.
Xave: average value
Xi: individual value
Sum: sum of
^2: squared
/: divided by
N: number of measurements
^1/2: square root.
More general terms
References
- ↑ Clinical Diagnosis & Management by Laboratory Methods, 19th edition, J.B. Henry (ed), W.B. Saunders Co., Philadelphia, PA. 1996, pg 75