Variance is a measure of dispersion, meaning it is a measure of how far a set of numbers is spread out from their average value. Pooled variance · Variance (disambiguation) · Conditional variance · Covariance |
V (X) is the average squared distance between X and its mean. Variance is a measure of dispersion, telling us how “spread out” a distribution is. |
Variance is a measurement of the spread between numbers in a data set. Investors use the variance equation to evaluate a portfolio's asset allocation. |
In general: Var[X+Y] ≠ Var[X] + Var[Y] Ex 1: Let X = ±1 based on 1 coin flip As shown above, E[X] = 0, Var[X] = 1 Let Y = -X; then Var[Y] = (-1)2Var[X] = 1 ... |
29 июн. 2021 г. · Variance is the average of the square of the distance from the mean. For this reason, variance is sometimes called the “mean square deviation.” |
To calculate the Variance, compute the difference of each from the mean, square it and find then find the average once again. So for this particular ... |
By definition, the variance of X is the average value of (X−μX)2. Since (X−μX)2≥0, the variance is always larger than or equal to zero. A large value of the ... |
In probability theory, the law of total variance or variance decomposition formula or conditional variance formulas or law of iterated variances also known as ... |
19 нояб. 2024 г. · Variance rule. Specifies the permitted minimum or maximum quantity of securities that can be delivered to satisfy a TBA trade. |
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