Read text formatted codebooks provided by some IPUMS extract systems such as NHGIS and Terra Area-level extracts in a format analogous to the DDIs available for other projects.
read_ipums_codebook(cb_file, data_layer = NULL)
Filepath to the codebook (either the .zip file directly downloaded from the website, or the path to the unzipped .txt file).
select-style notation for uniquely
identifying the data layer to load. Required for reading from .zip files
for extracts with multiple files.
ipums_ddi object with information on the variables included in the
csv file of a NHGIS extract.
# Example NHGIS extract nhgis_file <- ipums_example("nhgis0008_csv.zip") ddi <- read_ipums_codebook(nhgis_file)