Conditional Expectation Definition Expectation Definition Sigma-Algebra Definition Confidence Interval for the Mean Response in the Normal Linear Model Probability & Statistics Unbiasedness of the Ordinary Least Squares Estimator Under Exogeneity Probability & Statistics Integration with Respect to a Poisson Random Measure Poisson Processes Kakutani's Product Martingale Theorem Martingale Theory White Heteroskedasticity-Robust Covariance Consistency Theorem Probability & Statistics Weighted Least Squares Gauss-Markov Theorem Probability & Statistics Frisch-Waugh-Lovell Theorem Probability & Statistics Radon-Nikodym Theorem (Probabilistic) Martingale Theory Probability & Statistics Area