MEANING
An instrumental-variable condition requiring the instrument to affect the outcome only through the treatment.
Use it for
Describe the key no-direct-path assumption behind an instrumental variable.Use when explaining the assumption that an instrument affects an outcome only through the treatment.
Words that belong together
- satisfy the exclusion restriction
- violation of the exclusion restriction
- instrumental-variable assumption
On the page
If the encouragement changed attendance through another route, the exclusion restriction would fail.
Word forms
- Base
- exclusion restriction
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Usage notes
The restriction concerns direct pathways from instrument to outcome; it is substantive and generally cannot be verified from data alone.
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