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Instrumental Variable Estimation on STAR Strong instrument math scores Small vs. Regular class sizes

1Validity ScoreIV-ICL
0.8960.9230.950.977May 13, 2026

Evaluation results

MethodLinks
IV-ICLInstrument strength=Strong (ρ(Z, T) ≈ 0.89)2026.0510.0520.17
Whitehouse et al.Instrument strength=Strong (ρ(Z, T) ≈ 0.89)2026.0510.14816.2
Levis et al.Instrument strength=Strong (ρ(Z, T) ≈ 0.89)2026.0510.11615.9
Bayes-BPInstrument strength=Strong (ρ(Z, T) ≈ 0.89)2026.0510.22391.46
BayesInstrument strength=Strong (ρ(Z, T) ≈ 0.89)2026.0510.154168.46
Plug-inInstrument strength=Strong (ρ(Z, T) ≈ 0.89)2026.050.90.1057.84