The 1972-1974-1976 Series File includes 1972-1974-1976 panel data, 1972-1974 panel data and 1974-1976 panel data; these panels were conducted jointly with the 1972, 1974 and 1976 cross-section (time-series) studies, for which data are also included in the Series file.*
1972-1974-1976 Panel: Included were those 1972 cross-section respondents who were interviewed both pre and post in 1972 and successfully re-interviewed in 1974 and 1976 (pre and/or post). In addition are included 24 cases of 1972 pre-and-post respondents who were re-interviewed in 1976 (pre and post) even though they were NOT reinterviewed in 1974. In 1974 and 1976, attempts were made to follow movers who still lived within 50 miles of a sample area.
1972-1974 Panel: Included were the 1972 cross-section respondents who were interviewed in both waves in 1972 and reinterviewed in 1974, regardless whether they were interviewed again in 1976. Attempts were made to follow movers who still lived within 50 miles of a sample area. All but 24 cases in the 1972-1974-1976 panel file are also in the 1972-1974 panel file.
1974-1976 Panel: Included were 1974 cross-section respondents who were reinterviewed in 1976 (pre and/or post). The 1974-1976 panel included respondents not present in either of the other 2 panels because the 1974 cross-section incorporated new respondents as well as some of those who participated in both waves of the 1972 study. Attempts were made to follow movers who still lived within 50 miles of a sample area.
Participation in individual panels is summarized below (cross-section cases which were not considered part of any panel are not represented).
^^ 1 = 1972-1974-1976 PANEL - 1320 TOTAL CASES
2 = 1972-1974 PANEL - 1624 TOTAL CASES
3 = 1974-1976 PANEL - 1201 TOTAL CASES
1972 1972 1974 1976 1976
# IWs Pre Post Post Pre Post Panel ^^
----- ---- ---- ---- ---- ---- -----
807 X X X X X 1,2,3
376 X X X X X 1,2
70 X X X X 1,2,3
33 X X X X 1,2
3 X X X X 1,2,3
7 X X X X 1,2
24 X X X X 1
328 X X X 2
281 X X X 3
35 X X 3
5 X X 3
The 1974 cross-section with which reinterviews were sought in 1976 (for the
1974-1976 Panel) was obtained from a sample of households that was constructed
utilizing the 1972 sample. The 1972 sample of household units (HUs) was
subsampled at the rate of 1/3 and then supplemented to represent HUs and
citizens added to the study universe since 1972. Note that, for the 1974
cross-section, household members were considered for selection as respondents
if they were U.S. citizens 16 years of age and older, although respondents not
eligible to vote in 1974 were dropped from the released version of the 1974
cross-section datafile and from the released 1974-1976 panel datafile. The 3
components of the 1974 cross-section sample may be summarized as follows:
For 1), if the panel member was no longer residing at the panel HU and the HU was occupied, an individual was selected from present household members who were eligible, and an interview was sought with that new person. If, however, the panel member was still residing at the 1972 address, one of two procedures was followed, depending upon whether 'new' members were added to the household since 1972 who were eligible as respondents in 1974.** If no such newly-eligible member was added, then the panel member was interviewed for the cross-section. If, however, 1 or more newly-eligible members were aded to the household, the interviewer selected one person from all eligible members, using standard selection procedures. If this selected person was not the panel member, both the panel member and the 'new' selected household member were interviewed, but only the 'new' respondent's interview was included in the cross-section (the panel member's interview would be included in the panel). If the selected person was the panel member, the panel member was interviewed for the cross-section.
* There is 1 case in the 1976 time-series data release file that is not included in 1972-1974-1976 Series file data; it is represented in the ID file.
** 'New' members were defined as household members with zero chance of selection in 1972, including individuals underage to vote (16 or 17 years old) in 1972, but who were eligible as 18-or-19-year-olds in 1974. 'New' members also included individuals 16 or 17 years old in 1974 who would be eligible to vote in 1976 [for 1974-1976 Panel re-interviewing]. Approximately 1679 cross-section interviews were obtained WITH the inclusion of interviews with respondents who were only 16 or 17 years old in 1974.