STATS 205 - Hierarchical Linear Models (Winter 2025) - Lecture 2
JSB UCLA · 69:06 · Watch on YouTube
In this lecture the professor derives the ordinary least squares (OLS) estimator for the linear model y = Xβ + ε, β̂ = (XᵀX)⁻¹Xᵀy, and works out three of its properties: it is unbiased, its covariance is σ²(XᵀX)⁻¹, an...