Categorical values are factors in the R workspace, and value labels are attached in the Stata version (except when a categorical variable contains more than 50 categories.
All missing values are coded NA in the R Workspace.
Many variables, such as age, race, education, as well as variables that measure counts of events (drinks, times eating fruit, etc.) have alternate versions in the Calculated Variables section of the dataset. Review this section prior to choosing variables for analysis.