nhefs_complete is the same as nhefs, but only participants with complete data are included. The variables that need to be complete to be included are: qsmk, sex, race, age, school, smokeintensity, smokeyrs, exercise, active, wt71, wt82, and wt82_71.
nhefs_completeA data frame with 1556 rows and 67 variables. The codebook is available as nhefs_codebook.
Hern<U+00E1>n and Robins. Causal Inference. https://www.hsph.harvard.edu/miguel-hernan/causal-inference-book/