Easynomics

Proof that sample mean is unbiased

Proof that R squared is 0 if slope b1 is 0 (R2=0 iff b1=0)

Proof that annihilator matrix M is symmetric

Omitted variable bias, long and short regression

Proof ols estimator is unbiased

Proof that r squared is correlation coefficient squared

Proof that total sum of squares = explained sum of squares plus the sum of squared residuals

Panel data fixed effects regression within transformation

Proof of simple Ordinary Least Squares properties

Showing that the regression line passes through the mean of X and the mean of Y (EASY PROOF)

How to derive the Ordinary Least Squares coefficients EASY

Setting up the Ordinary Least Squares problem

How to derive the population regression coefficients (EASY)