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nhefs_codebook is the codebook for nhefs and nhefs_complete.
nhefs_codebook
nhefs
nhefs_complete
A data frame with 64 rows and 2 variables.
The variable being described
The variable description
Hern<U+00E1>n and Robins. Causal Inference. https://www.hsph.harvard.edu/miguel-hernan/causal-inference-book/