Question

How to Change Summation Expression $\sum_{i=1}^N \mathbf{X}_i^{\top}\mathbf{\Omega}^{-1}\mathbf{X}_i$ into Matrix Expression

score 151 · Answer 1 · 2014-10-25 04:11:26

151

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How to Change Summation Expression $\sum_{i=1}^N \mathbf{X}_i^{\top}\mathbf{\Omega}^{-1}\mathbf{X}_i$ into Matrix Expression

Published on 25 Oct 2014 - 4:11

score 80 · Answer 2 · 2026-03-27 12:02:55

80

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Show $E\left(\mathbf{X}_i \otimes \mathbf{u}_i\right)=\mathbf{0}$ implies $E\left(\mathbf{X}_i^{\top}\mathbf{G}\mathbf{u}_i\right)=\mathbf{0}$

Published on 27 Mar 2026 - 12:02

score 22 · Answer 3 · 2026-03-27 04:34:16

22

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score 68 · Answer 4 · 2014-10-29 12:36:31

68

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The Hessian Matrix I calculate is twice as much as it should be. Why?

Published on 29 Oct 2014 - 12:36

score 25 · Answer 5 · 2014-10-29 16:16:54

25

Views

Regression on even function?

Published on 29 Oct 2014 - 16:16

score 3.7k · Answer 6 · 2014-10-29 22:34:42

How to show for a simple regression with an intercept and one independent variable $R^2 = r ^2$ , where $r$ is the ordinary correlation coefficient.

score 70 · Answer 7 · 2014-11-03 22:10:05

70

Views

Conditional expectation; regression

Published on 03 Nov 2014 - 22:10

score 51 · Answer 8 · 2026-03-25 09:32:32

51

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score 44 · Answer 9 · 2014-11-05 10:09:13

44

Views

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Published on 05 Nov 2014 - 10:09

score 94 · Answer 10 · 2026-03-25 09:31:48

94

Views

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score 173 · Answer 11 · 2026-03-25 09:28:15

173

Views

Inference about the true intercept of the model and the OLS being BLUE

Published on 25 Mar 2026 - 9:28

score 2.3k · Answer 12 · 2014-11-06 21:06:58

2.3k

Views

For a general linear regression , are Y and Y hat independent?

Published on 06 Nov 2014 - 21:06

score 56 · Answer 13 · 2026-03-26 09:40:06

56

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score 545 · Answer 14 · 2014-11-10 00:07:50

545

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Multiple Regression with Categorical Predictor Variables of More than Two Levels

Published on 10 Nov 2014 - 0:07

score 339 · Answer 15 · 2026-03-28 01:47:29

339

Views

Standard Error in OLS Regression

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List Question

How to Change Summation Expression $\sum_{i=1}^N \mathbf{X}_i^{\top}\mathbf{\Omega}^{-1}\mathbf{X}_i$ into Matrix Expression

Show $E\left(\mathbf{X}_i \otimes \mathbf{u}_i\right)=\mathbf{0}$ implies $E\left(\mathbf{X}_i^{\top}\mathbf{G}\mathbf{u}_i\right)=\mathbf{0}$

Do multiclass logistic regressions obey Kolmogorov's second axiom?

The Hessian Matrix I calculate is twice as much as it should be. Why?

Regression on even function?

How to show for a simple regression with an intercept and one independent variable $R^2 = r ^2$ , where $r$ is the ordinary correlation coefficient.

Conditional expectation; regression

Proving an implication in a linear regression

derive the distribution(a multiple regression problem)

What is a common name for the resulting function?

Inference about the true intercept of the model and the OLS being BLUE

For a general linear regression , are Y and Y hat independent?

Outlier Contained in Prediction Interval (Tme series Forecasting Problem)

Multiple Regression with Categorical Predictor Variables of More than Two Levels

Standard Error in OLS Regression

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