Monitoring the Future: A Continuing Study of American Youth (12th-Grade Survey), 2004 (ICPSR 4264)

Time Period(s)

2004

Date of Collection

2004 (Spring)

Data Collection Notes

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 mtfinformation@umich.edu.

Variables omitted from the Western region questionnaires are noted in each codebook.

A user guide is provided with the study documentation. It contains a year-to-year cross-time question index for the MTF 12th-grade surveys that is sorted by subject area, item reference number, and questionnaire form.

To protect the privacy 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.

Sample

Multistage area probability sample design involving three selection stages: (1) geographic areas or primary sampling units (PSUs), (2) schools (or linked groups of schools) within PSUs, and (3) students within sampled schools. Of the 72 PSUs, 8 were selected with certainty, 10 were selected with a probability of .50, and the remainder were selected with probability proportionate to the size of the senior class. In schools with more than 350 seniors, a random sample of seniors or classes was drawn. In schools with less than 350 seniors, all seniors were asked to participate. Each 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). The total sample was divided into six subsamples consisting of an average of 2,300 respondents, and each subsample was administered a different form of the questionnaire, although all respondents answered the "core" drug and demographic questions. The participation rate among schools has been between 66 and 85 percent since the inception of the study.

Universe

High school seniors in the contiguous United States.

Unit(s) of Observation

individual

survey data

Mode of Data Collection

self-enumerated questionnaire

Response Rates

The overall student response rate for 2004 was 82 percent.

Original Release Date

2005-10-26

Version Date

2005-12-15

Version History

2005-12-15 A user guide that includes a cross-time question index that is relevant to all seven parts has been added.

2005-10-26 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:

• Standardized missing values.
• Created online analysis version with question text.
• Performed recodes and/or calculated derived variables.
• Checked for undocumented or out-of-range codes.

Weight

Each of the seven parts contains a weight variable, V5. They were originally varied by school but were modified to protect respondent confidentiality. Use the weight variable for all analyses, the results of which will differ slightly from published data tables that used original data.