# Nontestability of instrument validity under continuous treatments

> Research article (Biometrika, 2020) · cited 12× · AI/ML

**Wikidata**: [openalex:W3112418505](https://www.wikidata.org/wiki/openalex:W3112418505)  
**Source**: https://4ort.xyz/entity/nontestability-of-instrument-validity-under-continuous-treatments