Johnston, Lloyd D., Jerald G. Bachman, Patrick M. O'Malley, and John Schulenberg. Monitoring the Future: A Continuing Study of American Youth (8th- and 10th-Grade Surveys), 1999. ICPSR02940-v1. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2000. https://doi.org/10.3886/ICPSR02940.v1
Persistent URL: https://doi.org/10.3886/ICPSR02940.v1
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elementary school students,
junior high school students,
Date of Collection:
Enrolled 8th- and 10th-grade students in the contiguous
Data Collection Notes:
To protect the anonymity of respondents, all
variables that could be used to identify individuals have been
collapsed or recoded in the public use files. These modifications
should not affect analytic uses of the public use files.
year-to-year cross-time question indices for the MTF 8th- and
10th-grade surveys can be viewed on the SAMHDA Web site. The first is
sorted by question location and the second is sorted by subject area,
item number, and questionnaire form.
MTF does not release detailed geography codes in its public use files because of the disclosure risk it would cause. The MTF sample is drawn to generate representative samples of the four Census Bureau regions of the country (Northeast, Midwest, South, and West), but it does not generate representative samples of smaller geographic areas such as states, counties, or cities. For additional information about data that is withheld from the public use files please contact MTF directly at firstname.lastname@example.org.
Multistage area probability sample design involving three
election stages: (1) geographic areas or primary sampling units
(PSUs), (2) schools (or linked groups of schools) within PSUs, and (3)
students within sampled schools. Separate samples were drawn for each
grade. Of the 80 PSUs, 8 were selected with certainty and 72 were
selected with probability proportionate to size based on the size of
the 8th- (or 10th-) grade class in each school. In schools with more
than 400 8th (or 10th) graders, a random sample of students or classes
was drawn. In schools with less than 400 8th (or 10th) graders, all
students were asked to participate. Each sampled school was asked to
participate for two years, so that each year one-half of the sample is
replaced. Schools refusing participation were replaced with similar
schools in terms of geographic location, size, and type of school
(e.g., public, private/Catholic, private/non-Catholic). For the
8th-grade survey, schools with less than 15 8th graders were excluded
from the sample. For the 10th-grade survey, schools with less than 25
10th graders were excluded. The participation rate among schools has
been between 66 and 80 percent since the inception of the study. The
student response rates for the 1999 8th- and 10th-grade surveys were
87 percent and 85 percent, respectively.
Extent of Processing: ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of
disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major
statistical software formats as well as standard codebooks to accompany the data. In addition to
these procedures, ICPSR performed the following processing steps for this data collection:
Performed recodes and/or calculated derived variables.
Checked for undocumented or out-of-range codes.