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mostly-harmless-guide
Replication code and guide for Mostly Harmless Econometrics methods
skills/analysis/econometrics/mostly-harmless-guide/SKILL.md
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# Mostly Harmless Econometrics Guide
A skill providing replication code, explanations, and practical guidance for the econometric methods presented in Angrist and Pischke's "Mostly Harmless Econometrics" (MHE). Based on the mostly-harmless-replication repository (642 stars), this skill helps researchers understand and correctly apply core causal inference techniques.
## Overview
"Mostly Harmless Econometrics" is one of the most influential applied econometrics textbooks, providing accessible explanations of the methods that dominate modern empirical research in economics and increasingly in other social sciences. This skill translates the book's core methods into practical guidance that the agent can use to help researchers design studies, select appropriate estimators, and interpret results correctly.
The skill covers regression, instrumental variables, difference-in-differences, regression discontinuity, and related methods, with emphasis on the practical decisions researchers face when applying these techniques to real data.
## Regression Fundamentals
**Ordinary Least Squares (OLS)**
- OLS provides the best linear approximation to the conditional expectation function