Ratna Nandakumar

发表

Robustness of Ability Estimation to Multidimensionality in CAST with Implications to Test Assembly.

Yanwei Zhang, Ratna Nandakumar, R. Nandakumar, 2006 .

Validation of CATSIB To Investigate DIF of CAT Data.

Ratna Nandakumar, Louis Roussos, 1997 .

A Simulation Study of Missing Data with Multiple Missing X's

Ratna Nandakumar, Jonathan D. Rubright, Joseph J. Glutting, 2014 .

Confidence intervals and tests are two sides of the same research question

Ratna Nandakumar, Prathiba Natesan, R. Nandakumar, 2015 .

DIMTEST: A Fortran Program for Assessing Dimensionality of Binary Item Responses

Hua-Hua Chang, Brian W. Junker, Ratna Nandakumar, 1992 .

Investigating the impact of an integrated approach to the development of preservice teachers' technological pedagogical content knowledge (TPACK)

Chrystalla Mouza, Likun Hu, Rachel Karchmer-Klein, 2014, Comput. Educ..

Refinements of Stout’s Procedure for Assessing Latent Trait Unidimensionality

Ratna Nandakumar, William Stout, R. Nandakumar, 1993 .

Attitudinal Data: Dimensionality and Start Values for Estimating Item Parameters.

Ratna Nandakumar, James S. Roberts, Larry Hotchkiss, 2002 .

Differential Item Functioning Assessment in Cognitive Diagnostic Modeling: Application of the Wald Test to Investigate DIF in the DINA Model.

Jimmy de la Torre, Ratna Nandakumar, R. Nandakumar, 2014 .

An Examination of Rater Drift within a Generalizability Theory Framework.

Brian E. Clauser, Ronald J. Nungester, Ratna Nandakumar, 2009 .

Simultaneous DIF Amplification and Cancellation: Shealy-Stout's Test for DIF

Ratna Nandakumar, R. Nandakumar, 1993 .

MULTISIB: A Procedure to Investigate DIF When a Test is Intentionally Two-Dimensional

Ratna Nandakumar, Hsin-Hung Li, William Stout, 1997 .

Traditional Dimensionality Versus Essential Dimensionality

Ratna Nandakumar, R. Nandakumar, 1991 .

Assessing Unidimensionality of Polytomous Data

Feng Yu, Ratna Nandakumar, Hsin-Hung Li, 1998 .

Assessing Dimensionality of a Set of Items - Comparison of Different Approaches

Ratna Nandakumar, R. Nandakumar, 1992 .

ANALYSIS OF LATENT DIMENSIONALITY OF DICHOTOMOUSLY AND POLYTOMOUSLY SCORED TEST DATA

Brian Habing, Ratna Nandakumar, William Stout, 1996 .