標準差 - 维基百科 標準差(英语:Standard Deviation),数学符号σ,在概率統計中最常使用作為統計分佈程度(statistical dispersion)上的測量。標準差定義為方差的算术平方根,反映组内个体间的离散程度;标准差与期望值之比为标准离差率。測量到分佈程度的結果,原則上 ...
Standard Deviation Definition | Investopedia 1. A measure of the dispersion of a set of data from its mean. The more spread apart the data, the higher the deviation. Standard deviation is calculated as the square root of variance. 2. In finance, standard deviation is applied to the annual rate of re
Standard Deviation - Robert Niles A simpler explanation of standard deviation, written by a former math-major-turned-journalist who likes to explain math to people don't understand or just plain hate it. ... Written by Robert Niles I'll be honest. Standard deviation is a more difficult co
Standard Deviation -- from Wolfram MathWorld The standard deviation sigma of a probability distribution is defined as the square root of the variance sigma^2, sigma = sqrt(-^2) (1) = sqrt(mu_2^'-mu^2), (2) where mu=x^_= is the mean, mu_2^'= is the second raw moment, and denotes the ...
Standard Deviation and Variance (1 of 2) - David Lane This is part of HyperStat Online, a free online statistics book. ... The variance and the closely-related standard deviation are measures of how spread out a distribution is. In other words, they are measures of variability.
Standard Deviation and Variance - Math is Fun - Maths Resources Standard Deviation and Variance Deviation just means how far from the normal Standard Deviation The Standard Deviation is a measure of how spread out numbers are. Its symbol is σ (the greek letter sigma) The formula is easy: it is the square root of the V
Standard Deviation - Morningstar – Independent Investment Research Standard Deviation - Definition for Standard Deviation from Morningstar - This statistical measurement of dispersion about an average, depicts how widely a mutual fund's returns varied over a certain period of time.
Statistics: Standard Deviation - YouTube Review of what we've learned. Introduction to the standard deviation. More free lessons at: http://www.khanacademy.org/video?v=HvDqbzu0i0E
What is standard deviation? definition and meaning 1.Investment: Measure of the variability (volatility) of a security, derived from the security's historical returns, and used in determining the range of possible future returns. The higher the standard deviation, the greater the potential for volatility.
六標準差- 维基百科,自由的百科全书 六標準差,又稱六西格玛或6 sigma,是一套商业管理战略,最初于1986年由摩托罗拉创立。后来由于通用電氣第八任執行長杰克·韦尔奇(Jack Welch)的推广, ...