Question

Variance of a 2D random walk

score 303 · Answer 1 · 2020-08-22 20:07:58

303

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Variance of a 2D random walk

Published on 22 Aug 2020 - 20:07

score 18 · Answer 2 · 2026-03-18 13:37:17

18

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Variance of random variable (for least squares) after doubling dataset

Published on 18 Mar 2026 - 13:37

score 567 · Answer 3 · 2020-08-25 12:11:42

567

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Variance calculation for Beta Bernoulli model

Published on 25 Aug 2020 - 12:11

score 170 · Answer 4 · 2026-04-01 17:32:42

170

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Let $X$ be the value of the first dice and $Y$ the sum of the values when two dices are rolled. What is the correlation of $X$ and $Y$?

Published on 01 Apr 2026 - 17:32

score 97 · Answer 5 · 2020-08-25 19:11:36

97

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Expected value, variance, evaluating limits and probability of drawing a ball from the urn

Published on 25 Aug 2020 - 19:11

score 35 · Answer 6 · 2020-08-28 12:37:54

35

Views

Finding variance of $X$ when $X$ has pdf $f(x)=|x|^{-3}\mathbf{1}[|x|>1]$

Published on 28 Aug 2020 - 12:37

score 310 · Answer 7 · 2020-08-28 23:45:10

310

Views

Compute the variance in a result derived from a unit quaternion, when the quaternion variance-covariance matrix is known.

Published on 28 Aug 2020 - 23:45

score 84 · Answer 8 · 2020-08-31 20:55:57

84

Views

Do we have the following inequality $\operatorname{Var}(X\mid X\in A) \le \operatorname{Var}(X)$?

Published on 31 Aug 2020 - 20:55

score 832 · Answer 9 · 2020-09-01 18:07:28

832

Views

Variance of Conditional Variance

Published on 01 Sep 2020 - 18:07

score 50 · Answer 10 · 2020-09-03 08:20:21

50

Views

If $\operatorname{Cov}(X_i,X_j) = ij$, find $\operatorname{Var}(X_1 + 2X_2 + 3X_3)$

Published on 03 Sep 2020 - 8:20

score 745 · Answer 11 · 2020-09-03 10:27:54

745

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What is the estimated variance of Nelson-Aalen?

Published on 03 Sep 2020 - 10:27

score 379 · Answer 12 · 2020-09-04 02:43:02

379

Views

Expectation and variance of $Y = (X+2)^3$ where $X \sim \text{Ber}(p)$

Published on 04 Sep 2020 - 2:43

score 172 · Answer 13 · 2020-09-04 06:01:34

172

Views

Variance of number of matchs in a deck of card

Published on 04 Sep 2020 - 6:01

score 37 · Answer 14 · 2020-09-06 11:34:50

37

Views

Equal 1st and 2nd degree sums implies equal entries

Published on 06 Sep 2020 - 11:34

score 316 · Answer 15 · 2020-09-07 07:15:48

316

Views

Variance of sample mean of n rolls of fair 6-sided die

Published on 07 Sep 2020 - 7:15

List Question

Variance of a 2D random walk

Variance of random variable (for least squares) after doubling dataset

Variance calculation for Beta Bernoulli model

Let $X$ be the value of the first dice and $Y$ the sum of the values when two dices are rolled. What is the correlation of $X$ and $Y$?

Expected value, variance, evaluating limits and probability of drawing a ball from the urn

Finding variance of $X$ when $X$ has pdf $f(x)=|x|^{-3}\mathbf{1}[|x|>1]$

Compute the variance in a result derived from a unit quaternion, when the quaternion variance-covariance matrix is known.

Do we have the following inequality $\operatorname{Var}(X\mid X\in A) \le \operatorname{Var}(X)$?

Variance of Conditional Variance

If $\operatorname{Cov}(X_i,X_j) = ij$, find $\operatorname{Var}(X_1 + 2X_2 + 3X_3)$

What is the estimated variance of Nelson-Aalen?

Expectation and variance of $Y = (X+2)^3$ where $X \sim \text{Ber}(p)$

Variance of number of matchs in a deck of card

Equal 1st and 2nd degree sums implies equal entries

Variance of sample mean of n rolls of fair 6-sided die

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