Question

Exponential smoothing and variance

score 957 · Answer 1 · 2026-03-28 22:24:53

957

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Exponential smoothing and variance

Published on 28 Mar 2026 - 22:24

score 462 · Answer 2 · 2016-06-03 17:38:53

462

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Two random coins from a hat, let $X$ be the number of heads after flipping the chosen coin $n$ times. Find the variance of $X$.

Published on 03 Jun 2016 - 17:38

score 118 · Answer 3 · 2016-06-05 18:01:39

118

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calculate the variance and expectation

Published on 05 Jun 2016 - 18:01

score 485 · Answer 4 · 2016-06-10 20:08:00

485

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Understanding a Substep of the Proof for the Law of Total Variance

Published on 10 Jun 2016 - 20:08

score 84 · Answer 5 · 2026-03-31 03:28:12

84

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Show that $E(\mathrm{var}(Y|X)) \leq (1 - \mathrm{corr}(X,Y)^2) \mathrm{var}(Y)$

Published on 31 Mar 2026 - 3:28

score 162 · Answer 6 · 2016-06-12 03:46:06

162

Views

Joint density function negative variance for X and Y

Published on 12 Jun 2016 - 3:46

score 74 · Answer 7 · 2026-03-31 11:51:41

74

Views

Relevancy of standard deviation

Published on 31 Mar 2026 - 11:51

score 64 · Answer 8 · 2016-06-14 14:41:18

64

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Converting standard deviation of a score to standard deviation of a percent?

Published on 14 Jun 2016 - 14:41

score 4.1k · Answer 9 · 2016-06-17 01:02:17

4.1k

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Negative Variance

Published on 17 Jun 2016 - 1:02

score 80 · Answer 10 · 2026-03-29 00:16:29

80

Views

variance uniqueness

Published on 29 Mar 2026 - 0:16

score 363 · Answer 11 · 2026-03-29 15:35:09

363

Views

Since the variance matrix is the expected value of a dyadic tensor, why is it not singular? Which is the probabilistic property behind that?

Published on 29 Mar 2026 - 15:35

score 1.3k · Answer 12 · 2016-06-22 17:21:52

1.3k

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Deriving Beta From Covariance

Published on 22 Jun 2016 - 17:21

score 27 · Answer 13 · 2016-06-24 11:42:36

27

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Basic question about how to calculate a variance

Published on 24 Jun 2016 - 11:42

score 339 · Answer 14 · 2016-06-26 14:38:12

339

Views

Which has higher variance, coin toss vs dice roll?

Published on 26 Jun 2016 - 14:38

score 79 · Answer 15 · 2016-07-03 19:57:50

79

Views

Why doesn't the Variance of a Random Variable use $\frac{1}{n}$ instead of $P(X=x_i)$? Aren't the weights already expressed in the Mean?

Published on 03 Jul 2016 - 19:57

List Question

Exponential smoothing and variance

Two random coins from a hat, let $X$ be the number of heads after flipping the chosen coin $n$ times. Find the variance of $X$.

calculate the variance and expectation

Understanding a Substep of the Proof for the Law of Total Variance

Show that $E(\mathrm{var}(Y|X)) \leq (1 - \mathrm{corr}(X,Y)^2) \mathrm{var}(Y)$

Joint density function negative variance for X and Y

Relevancy of standard deviation

Converting standard deviation of a score to standard deviation of a percent?

Negative Variance

variance uniqueness

Since the variance matrix is the expected value of a dyadic tensor, why is it not singular? Which is the probabilistic property behind that?

Deriving Beta From Covariance

Basic question about how to calculate a variance

Which has higher variance, coin toss vs dice roll?

Why doesn't the Variance of a Random Variable use $\frac{1}{n}$ instead of $P(X=x_i)$? Aren't the weights already expressed in the Mean?

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