statistics. Symbol s.d., σ. A measure of the variability in a set of numbers, equal to the square root of the variance (a less convenient measure of variability, as is also the mean deviation). The deviation for each number is the difference between it and the mean value for the set. Clearly, averaging the signed values would produce zero, by the definition of the mean. The ...
Reference Entry. 395 words.
Subjects: Numerical and Computational Mathematics
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