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DIFAS: Differential Item Functioning Analysis System. Computer Program Exchange

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Penfield, Randall D. – Applied Psychological Measurement, 2005

Differential item functioning (DIF) is an important consideration in assessing the validity of test scores (Camilli & Shepard, 1994). A variety of statistical procedures have been developed to assess DIF in tests of dichotomous (Hills, 1989; Millsap & Everson, 1993) and polytomous (Penfield & Lam, 2000; Potenza & Dorans, 1995) items. Some of these…

Descriptors: Test Bias, Item Analysis, Psychological Studies, Evaluation Methods

Some Important Changes in Educational Research Methods over the Past 20 Years.

Borg, Walter R. – 1984

By comparing the first and fourth editions of a research methods text, the author identifies and discusses some major changes in educational research metholodogy that have occurred over the past 20 years. Some of the changes relate to ethics and legal constraints in conducting research, research and development, evaluation research, the…

Descriptors: Classroom Observation Techniques, Educational Trends, Evaluation Methods, Legal Responsibility