Why does multicollinearity increase the variance of the coefficient estimates?
118539
Is there an intuitive explanation why multicollinearity is a problem in linear regression?
24455
Collinearity diagnostics problematic only when the interaction term is included
157399
How to interpret the coefficient of variation?
41386
Should one be concerned about multi-collinearity when using non-linear models?
41983
What happens when I include a squared variable in my regression?
39548
Multicollinearity in OLS
87448
Why is a sample covariance matrix singular when sample size is less than number of variables?
132204
Why does the standard error of the intercept increase the further $\bar x$ is from 0?
120879
Why is OLS estimator of AR(1) coefficient biased?
88363
Why is propagation of uncertainties quadratic rather than linear?
55707
Why does the correlation coefficient between X and X-Y random variables tend to be 0.7
99651
Why does ridge estimate become better than OLS by adding a constant to the diagonal?
8823
Why the significance of terms in orthogonal polynomial regression changes with the degree of the regression
36464
How to interpret coefficients from a polynomial model fit?
152404
Why does t statistic increase with the sample size?
151995
Why are effect size estimates (such as $R^2$) difficult in mixed-effects models?
157430
In multiple regression, a coefficient gets opposite sign in subsample than in the full sample