Econometrics Explained: The Core Difference Between Pooled & Longitudinal Data скачать в хорошем качестве

Econometrics Explained: The Core Difference Between Pooled & Longitudinal Data

Welcome to this deep dive into one of econometrics' most common confusions: the difference between Pooled Data and Panel Data! Ignoring this distinction leads to the serious "Amnesia" mistake. In this video, we clarify the "DNA" of each and why the distinction matters: Pooled Data (Pooled Cross-Sections): Taking several independent snapshots and increasing sample size. Panel Data (Longitudinal Data): Tracking the exact same entities over time (the "movie" version). The Amnesia Mistake: Using Pooled OLS on Panel Data, thereby forgetting the individual's identity. The Math: How the crucial Fixed Effect ($\alpha_i$) of Unobserved Heterogeneity is handled in Panel Models and why ignoring it causes Endogeneity and biased results. Real-World Examples: Applications in the Labor Market and National GDP analysis. Learn to ask the right question—"Am I tracking the same entity?"—and choose the correct techniques, like Fixed Effects or Random Effects, to get reliable estimates. (References: Wooldridge, Gujarati, Baltagi)