When is OLS unbiased and what is the relation with weak orthogonality?
140241
Proving OLS unbiasedness without conditional zero error expectation?
9356
Derivation of the formula for Ordinary Least Squares Linear Regression
84999
$\exp(A)$ is orthogonal iff $A$ is skew symmetric
48579
How to find the orthogonal complement of a subspace?
26961
How do I calculate standard errors for sums of OLS coefficients?
148595
Find Orthogonal complement
56923
Are estimates of regression coefficients uncorrelated?
145885
Linear transformation preserving orthogonality
66500
Proving that orthogonal vectors are linearly independent
59477
Density of orthogonal matrices with rational coefficients
1865
Sub-determinants of an orthogonal matrix
42427
Understanding linear algebra in Ordinary Least Squares derivation
87493
Unbiased estimator with minimum variance for $1/\theta$
65525
Unbiased estimator of a uniform distribution
137863
How can I formally show that a root n consistent estimator is weakly consistent?
150141
Showing $X$, $Y$ are not independent but $\operatorname{Cov}[X, Y] = 0$
14481
How do I show that the sum of residuals of OLS are always zero using matrices