National participation rates in writing
The national school participation rate for public and private schools combined were 97 percent for grade 8 and 89 percent for grade 12. Student participation rates were 92 percent for grade 8 and 80 percent for grade 12. Participation rates needed to be 70 percent or higher to report results separately for private schools. While the school participation rate for private schools met the standard for grade 8 in 2007, it fell below the standard for grade 8 in 2002 and for all three assessment years at grade 12. Therefore, the only comparison that could be made for private school students was between 1998 and 2007 at grade 8. Participation rates for Catholic schools, however, were sufficient for reporting in 2007 at both grades and in the two previous assessment years, with the exception of 2002 for grade 12.
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National school and student participation rates in NAEP writing at grade 12, by type of school: 2007
The student-weighted school participation rates are calculated based on the estimated number of students represented by either the initially selected schools that participated in the assessment (before substitution) or the participating schools, whether originally selected or selected as a substitute for a school that chose not to participate (after substitution). The school-weighted school participation rates are calculated based on the estimated number of schools either before or after substitutions.