1. (1 p) Data subset (from Class 07).

  2. (1 p) Rename variables (from Class 07).

  3. (3 p) Code missing variables.

  4. (3 p) Label factor variable levels.

  5. (1 p) Choose whether to remove records with missing values with na.omit() (only if numbers of observations doesn’t drop more than 10%), and indicate with R output that this was done correctly (e.g., str(), dim(), summary()).

  6. (1 p) Numerical summaries of all variables (from Class 07).

The sections from Erik’s S4R_Project_All_Erik_NESARC.Rmd file to focus on are