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Trends in International Mathematics and Science Study, 2019
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The Trends in International Mathematics and Science Study, 2019 (TIMSS 2019) is a data collection that is part of the Trends in International Mathematics and Science Study (TIMSS) program; program data are available since 1995 at https://nces.ed.gov/pubsearch/getpubcats.asp?sid=073. TIMSS 2019 (https://nces.ed.gov/timss/) is a cross-sectional study that provides international comparative information of the mathematics and science achievement of fourth- and eighth-grade students and gathers background contexts for learning. The study was conducted using direct assessments of students and questionnaires for students, teachers, and school administrators. Fourth- and eighth-graders in the 2018–19 school year were sampled. Key statistics produced from TIMSS 2019 provide reliable and timely data on the mathematics and science achievement of U.S. students compared to that of students in other countries.
Detailed Methodology
The international desired target population is all students enrolled in the grade that represents 4 or 8 years of schooling. The sample design employed by the TIMSS 2019 assessment is generally referred to as a two-stage stratified cluster sample: the first stage involves sampling schools and the second involces selecting classrooms within sampled schools. TIMSS guidelines call for a minimum of 150 schools to be sampled per grade, with a minimum of 4,000 students assessed per grade. In the United States, around 250 schools participated at the 4th grade and around 250 at the 8th grade.