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University of Delaware

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Ratna Nandakumar, Ph. D.
nandakum@udel.edu

 Meditation is the infallible means of conquering the restlessness of the mind.... Meditation is the heart of yoga, the root of sadhana the master key to knowledge, the stream of love.
[Page 39, Play of Consciousness]
. I teach courses in application of statistics and psychometrics in education and social sciences. My research interests span two major areas with in the field of Item Response Theory in psychometrics: Dimensionality and Differential item functioning (DIF). I have contributed to the development and modifications of statistical methodologies for assessing dimensionality and DIF. Currently I am working (with Roussos, L) on the development of a statistical procedure for assessing DIF of computerized adaptive test items. My publications include:
  • “MULTISIB - A procedure to investigate DIF when a test is intentionally multidimensional” in Applied Psychological Measurement with (Stout, W., Li, H., & Habing);
  • “Assessing unidimensionality of polytomous data” in Applied Psychological Measurement (with Yu, Li, H., & Stout, W); and
  • “Traditional dimensionality vs. essential dimensionality” in Journal of Educational Measurement.
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Last revised May 18, 2000.