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Instrumental variables I: instrumental variables exploit natural variation in nonexperimental data to estimate causal relationships
The gold standard of study design for treatment evaluation is widely acknowledged to be the randomized controlled trial (RCT). Trials allow for the estimation of causal effect by randomly assigning participants either to an intervention or comparison group; through the assumption of “exchangeability...
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| Main Authors: | , , , , |
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| Format: | Artigo |
| Language: | Inglês |
| Published: |
2009
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| Subjects: | |
| Online Access: | https://ncbi.nlm.nih.gov/pmc/articles/PMC2905668/ https://ncbi.nlm.nih.gov/pubmed/19356901 https://ncbi.nlm.nih.govhttp://dx.doi.org/10.1016/j.jclinepi.2008.12.005 |
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