What is the relationship between $\text{Cov}[\mathbf{X},\mathbf{X}]$ and $(\mathbf{X}^T \mathbf{X})^{-1}$ in multiple regression?
6293
Is there a way to use the covariance matrix to find coefficients for multiple regression?
710
Importance of predictors in multiple regression: Partial $R^2$ vs. standardized coefficients
20153
What is the distribution of $R^2$ in linear regression under the null hypothesis? Why is its mode not at zero when $k>3$?
84662
Question on the correlation between two dependent variables
92434
Hat matrix and leverages in classical multiple regression
110894
Does the variance of a sum equal a double sum of covariances?
5686
Similarities and differences between correlation and regression
22421
X and Y are not correlated, but X is significant predictor of Y in multiple regression. What does it mean?
76853
Interpretation of $\mathbf{y}^T(\mathbf{I}-\mathbf{H})\mathbf{y}$ in OLS
87993
Proof of normal equation in regression using tensor notation
122562
Cross product term in linear regression why is it zero
120206
How to interpret coefficients of $x$ and $x^2$ in same regression
17773
Why is polynomial regression considered a special case of multiple linear regression?
63716
A question in directional derivatives of a quantile regression object function
36565
Box-Cox transformation vs. predictor transformation in multiple linear regression
3401
The variance of linear regression estimator $\beta_1$
25242
Find $\operatorname{Cov}(F_n^* (x), F_n^* (y))$ for fixed real numbers $x, y$ where $F_n^* (x)$ is a sample distribution function