| as_factor | Convert labelled vectors to factors | 
| as_factor.data.frame | Convert labelled vectors to factors | 
| as_factor.haven_labelled | Convert labelled vectors to factors | 
| as_factor.labelled | Convert labelled vectors to factors | 
| format_tagged_na | "Tagged" missing values | 
| is.labelled | Create a labelled vector. | 
| is_tagged_na | "Tagged" missing values | 
| labelled | Create a labelled vector. | 
| labelled_spss | Labelled vectors for SPSS | 
| na_tag | "Tagged" missing values | 
| print_labels | Print the labels of a labelled vector | 
| print_tagged_na | "Tagged" missing values | 
| read_dta | Read and write Stata DTA files | 
| read_por | Read and write SPSS files | 
| read_sas | Read SAS files | 
| read_sav | Read and write SPSS files | 
| read_spss | Read and write SPSS files | 
| read_stata | Read and write Stata DTA files | 
| read_xpt | Read and write SAS transport files | 
| tagged_na | "Tagged" missing values | 
| write_dta | Read and write Stata DTA files | 
| write_sav | Read and write SPSS files | 
| write_xpt | Read and write SAS transport files | 
| zap_empty | Convert empty strings into missing values | 
| zap_formats | Remove format attributes | 
| zap_label | Zap variable labels | 
| zap_labels | Zap value labels | 
| zap_labels.haven_labelled_spss | Zap value labels | 
| zap_missing | Zap special missings to regular R missings | 
| zap_widths | Remove display width attributes |