Why does the final version of the data have more variables than the preliminary version did? Why do some cases lack data for the additional variables?
The original 1880 data from the North Atlantic Population Project (NAPP) did not include a number of variables from the 1880 census form, and thus these variables were not included in the preliminary release. For cases that were linked as a part of the preliminary Linked Representative Samples, however, we have entered the additional information and released it as part of the final version. These variables include LIT, SCHOOL, MAIMED, INSANE, IDIOTIC, DEAF, BLIND, SICKNESS, MOUNEMP, MARRINYR, and BIRTHMO. These variables are not available for cases that appear in the final version of the Linked Representative Samples but did not appear in the preliminary version.
