R: Vignettes and other documentation

# Vignettes and other documentation

## Vignettes from package 'labelled'

labelled::labelled |  | Introduction to labelled | HTML | source | R code
labelled::look_for |  | Generate a data dictionary and search for variables with `look_for()` | HTML | source | R code
labelled::missing_values |  | About missing values: regular NAs, tagged NAs and user NAs | HTML | source | R code
labelled::packed_columns |  | Variables labels and packed columns | HTML | source | R code