This technical report describes several methods used to establish statistical links between the 2011 National Assessment of Educational Progress (NAEP) and the 2011 Trends in International Mathematics and Science Study (TIMSS) in mathematics and science at grade 8. The goal of the 2011 NAEP-TIMSS linking study, supported by the National Center for Education Statistics (NCES), was to obtain comparable TIMSS results for U.S. states that participated in NAEP but did not participate in TIMSS. Based on the results from the 2011 linking study, it was found that NAEP performance data can be expressed in the metric of TIMSS. By expressing both assessments in the same metric, the TIMSS mean and benchmark percentages that each state might have obtained (had that state actually taken TIMSS) can be reported and compared to international TIMSS results.
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