# standard deviation (SD)

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^{[1]}

## 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