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Nick HK on Twitter: "Have you ever heard of weak-instrument bias? Where an excluded variable that only WEAKLY predicts treatment can induce bias in the estimated treatment effect? Well, how about STRONG-instrument
![Bias in causal estimates from Mendelian randomization studies with weak instruments - Burgess - 2011 - Statistics in Medicine - Wiley Online Library Bias in causal estimates from Mendelian randomization studies with weak instruments - Burgess - 2011 - Statistics in Medicine - Wiley Online Library](https://onlinelibrary.wiley.com/cms/asset/84356fd8-c92c-416e-964b-542647bb44d4/mfig004.jpg)
Bias in causal estimates from Mendelian randomization studies with weak instruments - Burgess - 2011 - Statistics in Medicine - Wiley Online Library
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Amazon.co.jp: Contemporary Guitar Co. GG Super Mute Guitar Weak Instrument/Light Blue : Musical Instruments
![PDF] Weak instruments and the first stage F-statistic in IV models with a nonscalar error covariance structure | Semantic Scholar PDF] Weak instruments and the first stage F-statistic in IV models with a nonscalar error covariance structure | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/ce2727789c8d7c6d8c696c68c9eb9379081a1baa/17-Table2-1.png)
PDF] Weak instruments and the first stage F-statistic in IV models with a nonscalar error covariance structure | Semantic Scholar
![PDF] Weak‐instrument robust inference for two‐sample instrumental variables regression | Semantic Scholar PDF] Weak‐instrument robust inference for two‐sample instrumental variables regression | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/cd96cbe3daa4f20d973beede92c0e1b913c41dfc/31-Table2-1.png)