Topic: Weak-Instrument Diagnostics

Why the F-Statistic Rule of Ten Is Limited

Why Conventional IV Wald Inference Fails

Weak Identification Versus Underidentification

Weak-Strength Diagnostics for Binary Instruments

The Pretesting Pitfall in Weak-IV Analysis

The Concentration Parameter and Instrument Strength

The Conditional Likelihood Ratio Test

The Cragg-Donald Statistic

The Effective F Statistic

The First-Stage F Statistic