The square root of variance and probably the most commonly used measure of variation. The principal alternative is the interquartile range, which is more robust, but less mathematically tractable than the standard deviation.
Used in Chap. 13: page 151; Chap. 14: pages 174, 179
Also used in hcistats2e: Chap. 1: page 16; Chap. 2: page 25; Chap. 3: pages 31, 42, 43; Chap. 4: pages 50, 52, 53, 56, 57; Chap. 8: pages 90, 92, 93; Chap. 10: page 113; Chap. 12: page 141; Chap. 13: pages 150, 151
Also known as: s.d.
Used in glossary entries: interquartile range, standard deviation (s.d., σ), variance
Links:
Wikipedia: Standard deviation- British Medical Journal: Mean and standard deviation
- Laerd Statistics: Standard Deviation
- MathsIsFun: Standard Deviation and Variance