Why the leverage is the diagonal elements of the Hat matrix?
92434
Hat matrix and leverages in classical multiple regression
17394
Sign of determinant when using $det A^\top A$
49946
A determinant coming out from the computation of a volume form
28155
Two questions about diagonalization
18014
Matrix multiplication: interpreting and understanding the process
2898
What's the MSE of $\hat{Y}$ in ordinary least squares using bias-variance decomposition?
52946
If $X$ is an orthogonal matrix, why does $X^TX = I$?
66995
Why is a projection matrix symmetric?
47589
Product of a primitive matrix and its transpose.
130914
Why do elementary row operations preserve linear dependence between matrix columns?
56312
Why can this product of rectangular matrices not be the identity matrix?
109471
The eigenvectors of the transpose operator
134510
How do you get $\rm{var}(\Theta -\hat\theta) = \rm{var}(\Theta)$?
38169
Bounds on off-diagonal entries of a correlation matrix
22222
Properties of zero-diagonal symmetric matrices
70723
Why are nonsquare matrices not invertible?
71231
Determinant of circulant-like matrix