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Direct linkGlynn, Shawn M. – Journal of Research in Science Teaching, 2012
The Trends in International Mathematics and Science Study (TIMSS) is a comparative assessment of the achievement of students in many countries. In the present study, a rigorous independent evaluation was conducted of a representative sample of TIMSS science test items because item quality influences the validity of the scores used to inform…
Descriptors: Foreign Countries, Item Response Theory, Psychometrics, Science Tests
Peer reviewedMayer, Victor J.; Rojas, Carlos A. – Journal of Research in Science Teaching, 1982
Determined effect of testing frequency on data obtained using intensive time-series design. Eighth-grade, earth science student attitudes toward science class and class achievement data were not affected by frequency of data collection. Results of a previous study were also replicated, giving increased confidence in validity of data yielded by the…
Descriptors: Academic Achievement, Data Collection, Earth Science, Grade 8
