Question modules are dropped when they are no longer age appropriate. After 1994, the schedule changed to biennial. In 1989 and 1990 personal interviews were conducted using both paper and computerized questionnaires. Paper interviewing continued in 1991 and 1992. Dependent interviewing For each interview, there is an extensive preload of household, employment, and personal information that was gathered in previous interviews.
Some information is collected in an event history format.
Processing - Family composition editing. In addition to the public-use files, geocode files are available to researchers who agree in writing to adhere to the BLS confidentiality policy and whose projects further the mission of BLS and the NLS program to conduct sound, legitimate research in the social sciences. The geocode files include the State, metropolitan area, and county of residence of each respondent in each survey year. The files also include selected environmental variables from the City and County Data Books. Researchers who are granted access to the geocode files are permitted to use the data are permitted to use the data at their own facilities.