Frequency and percentage distributions displayed in the 2008 codebooks are unweighted, rather than weighted by variable V5 as they had been in previous years. This change was made to simplify both the production of the codebooks and their interpretation
by the analyst.
A user guide is
provided with the study documentation. It contains two year-to-year cross-time question indices for the MTF 8th- and 10th-grade surveys.
The first is sorted by subject area and the second is sorted by question location.
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 email@example.com.
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.
Variables omitted from the Western region
questionnaires are noted in each codebook.
In 2005, two of the questionnaire forms had a
new version of the race question. It included Hispanic as one of
the categories in addition to Black and White. For 2008, all four
forms had this new version for the race variable.
This study was conducted by the Survey Research Center, Institute for Social Research at the University of Michigan.