Variance is a measure of dispersion, meaning it is a measure of how far a set of numbers are spread out from their average value. It is the second central moment of a distribution, and the covariance of the …

方差（variance）这个名词率先由罗纳德·费希尔（Ronald Fisher）在1918年发表的论文《孟德尔遗传假定下的亲缘之间的相关性》 (《The Correlation between Relatives on the Suppositionof Mendelian …

Note: Variance uses squared units. Here it is 21,704 mm2. Taking the square root gives Standard Deviation back in millimeters. ... Sample Variance = 108,520 / 4 = 27,130 Sample Standard …

2 days ago · Variance is a number that tells us how spread out the values in a data set are from the mean (average). It shows whether the numbers are close to the average or far away from it.

Jun 17, 2025 · Variance is a measurement of dispersion across a data set, comparing the difference between every other number in the set.

Variance is a measure of variability in statistics that assesses the average squared difference between data values and the mean.

Jan 2, 2025 · ‘Variance’ refers to the spread or dispersion of a dataset in relation to its mean value. A lower variance means the data set is close to its mean, whereas a greater variance indicates a larger …

Jan 18, 2023 · The variance reflects the variability of your dataset by taking the average of squared deviations from the mean.

Variance is a statistic that is used to measure deviation in a probability distribution. Deviation is the tendency of outcomes to differ from the expected value.

變異數 （英語： variance）又稱 变异数[1] 、 變方[2]，在 概率论 及 统计学 中，描述的是一个 随机变量 的离散程度，即一组数字与其平均值之间的距离的度量，是随机变量与其 总体 均值或样本均值的 离 …