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Variance - why is the denominator squared?

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#statistics #variance #linear-regression
166
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Expected value and variance of a set of random variables

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#probability #random-variables #expected-value #variance
940
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Bounded variance for Lipschitz function of random variable

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#random-variables #variance #lipschitz-functions
212
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How can I construct a PDF that has infinite variance?

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#probability-distributions #variance
409
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Find $Var(XY)$ for $X,Y$ chosen from a unit square.

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#probability #variance
137
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Cramer-Rao lower bound for an efficient estimator

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#variance #estimation
26
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Show that $\text{Cov}(AY)=A\text{Cov}(Y)A^T$

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#vectors #expected-value #variance #covariance
54
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How to show that $\operatorname{var}(X_{(1)}) = \operatorname{var}(X_{(n)})$ for $X_i \sim U(0, 1)$?

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#probability-distributions #uniform-distribution #variance #order-statistics
55
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Calculate mean and variance of a function of random variables

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#probability #random-variables #normal-distribution #variance #means
36
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How to quickly find the variance of a Gaussian random variable from the density?

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#normal-distribution #variance #density-function #gaussian
963
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"Reverse" Chebyshev Inequality that gives lower bound of being far from mean

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#probability #variance #binomial-distribution
32
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Adding Variances vs Not

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#random-variables #independence #variance
74
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Remove half the points to minimize variance

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#optimization #variance
139
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Variance of the Square

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#statistics #normal-distribution #variance #sums-of-squares
22
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Minimum variance for a given IQR in a sample of 7

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#statistics #variance

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