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Glynn, 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

Gardner, P. L. – Journal of Research in Science Teaching, 1987
Discusses the complicating effects of ambivalence on the validity of science attitude measurement scales. Cites studies indicating that the positive and negative effects about a particular psychological object are not necessarily bipolar. Suggests the use of factor analysis to check dimensionality in instruments. (TW)
Descriptors: Attitude Measures, Factor Analysis, Forced Choice Technique, Item Analysis