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iv-regression-guide

Apply instrumental variables, 2SLS, and address endogeneity issues

skills/analysis/econometrics/iv-regression-guide/SKILL.md

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# Instrumental Variables Regression Guide

A skill for applying instrumental variables (IV) estimation to address endogeneity in regression models. Covers the logic of IV, two-stage least squares (2SLS), instrument validity tests, weak instrument diagnostics, and reporting standards.

## The Endogeneity Problem

### Why OLS Fails

```
Ordinary Least Squares assumes:  E[u | X] = 0
(Regressors are uncorrelated with the error term)

This assumption is violated when:
  - Omitted variable bias: A confound affects both X and Y