177 IV6 Exclusion restriction
About this lesson
In this video, we delve into the crucial second condition for a valid instrumental variable: the exclusion restriction. We explain why an instrument must not only affect your explanatory variable but also avoid impacting the outcome variable directly through any other channel. This video clarifies the common confusion students face regarding the varying number of conditions and inconsistent naming conventions for this essential requirement across different econometrics textbooks. We use a practical example to illustrate how to identify potential direct paths and the importance of reasoned argumentation when testing this condition. Visit AxiomTutoring.com and subscribe to @AxiomTutoringCourses for more econometrics insights.
Walkthrough
Follow the reasoning, step by step.
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