| 单词 | standard deviation |
| 释义 | standard deviation A measure of the dispersion of data in statistics. For a set of values a1, a2, a3, … an, the mean m is given by (a1 + a2 + … + an)/n. The deviation of each value is absolute value of the difference from the mean | m - a1 |, etc. The standard deviation is the square root of the mean of the squares of these values, i.e. v[(| m - a1 |2 + … | m - an |2)/n] When the data is continuous the sum is replaced by an integral |
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