Question

How is generalized sample variance defined?

score 1.6k · Answer 1 · 2019-10-22 07:18:37

1.6k

Views

How is generalized sample variance defined?

Published on 22 Oct 2019 - 7:18

score 1k · Answer 2 · 2026-03-27 13:46:23

1k

Views

Unachievable Cramer-Rao lower bound

Published on 27 Mar 2026 - 13:46

score 174 · Answer 3 · 2026-03-26 17:29:51

174

Views

Principal components analysis (dimensionality reduction)

Published on 26 Mar 2026 - 17:29

score 192 · Answer 4 · 2019-10-24 02:44:24

192

Views

stuck trying to compute variance of continuous random variable

Published on 24 Oct 2019 - 2:44

score 592 · Answer 5 · 2019-10-24 05:03:01

592

Views

Variance of EWMA (Exponentially Weighted Moving Average)

Published on 24 Oct 2019 - 5:03

score 56 · Answer 6 · 2026-03-27 06:13:23

56

Views

Joint sampling PDF of sample mean and sample variance

Published on 27 Mar 2026 - 6:13

score 202 · Answer 7 · 2026-03-27 05:05:51

202

Views

Mean and variance of a probability generating function(Bert Fristedt).

Published on 27 Mar 2026 - 5:05

score 187 · Answer 8 · 2026-02-23 10:05:59

187

Views

Birthday problem: By symmetry, the variance is $\text{Var}(X) = 365 \text{Var}(I_1) + 2 {365 \choose 2} \text{Cov}(I_1, I_2)$.

Published on 23 Feb 2026 - 10:05

score 43 · Answer 9 · 2019-10-27 20:13:48

43

Views

Expected value of a summation of random variable when $N$ is also a RV

Published on 27 Oct 2019 - 20:13

score 1.3k · Answer 10 · 2019-10-27 23:08:58

1.3k

Views

How do I find the variance of $\hat\theta_\text{MLE}$ for $f_{\theta}(x) = \theta x^{\theta-1}$?

Published on 27 Oct 2019 - 23:08

score 51 · Answer 11 · 2019-10-28 05:25:24

51

Views

How did the author get that $\mathbb{E}(N) = 2$ and $\text{Var}(N) = 2$?

Published on 28 Oct 2019 - 5:25

score 74 · Answer 12 · 2019-10-28 14:35:18

74

Views

Misunderstanding of expected value theory/application: Why $\sum_{N=0}^4 N^2 \cdot P(N)$ rather than $\sum_{N=0}^4 N^2 \cdot P(N^2)$?

Published on 28 Oct 2019 - 14:35

score 973 · Answer 13 · 2019-10-29 09:29:36

973

Views

Conditional variance: How did the author get from $\text{Var}(Y | X) = E((Y - E(Y | X))^2 | X)$ to $\text{Var}(Y | X) = E(Y^2 | X) - (E(Y | X))^2$?

Published on 29 Oct 2019 - 9:29

score 71 · Answer 14 · 2019-10-29 13:01:20

71

Views

Convergence rate of reciprocal of a random variable

Published on 29 Oct 2019 - 13:01

score 124 · Answer 15 · 2026-03-27 14:59:09

124

Views

Proof clarification: For any r.v.s $X$ and $Y$, $-1 \le \text{Corr}(X, Y) \le 1$.

Published on 27 Mar 2026 - 14:59

List Question

How is generalized sample variance defined?

Unachievable Cramer-Rao lower bound

Principal components analysis (dimensionality reduction)

stuck trying to compute variance of continuous random variable

Variance of EWMA (Exponentially Weighted Moving Average)

Joint sampling PDF of sample mean and sample variance

Mean and variance of a probability generating function(Bert Fristedt).

Birthday problem: By symmetry, the variance is $\text{Var}(X) = 365 \text{Var}(I_1) + 2 {365 \choose 2} \text{Cov}(I_1, I_2)$.

Expected value of a summation of random variable when $N$ is also a RV

How do I find the variance of $\hat\theta_\text{MLE}$ for $f_{\theta}(x) = \theta x^{\theta-1}$?

How did the author get that $\mathbb{E}(N) = 2$ and $\text{Var}(N) = 2$?

Misunderstanding of expected value theory/application: Why $\sum_{N=0}^4 N^2 \cdot P(N)$ rather than $\sum_{N=0}^4 N^2 \cdot P(N^2)$?

Conditional variance: How did the author get from $\text{Var}(Y | X) = E((Y - E(Y | X))^2 | X)$ to $\text{Var}(Y | X) = E(Y^2 | X) - (E(Y | X))^2$?

Convergence rate of reciprocal of a random variable

Proof clarification: For any r.v.s $X$ and $Y$, $-1 \le \text{Corr}(X, Y) \le 1$.

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