Search results for author:"Ratna Nandakumar"
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Journal of Educational Measurement Vol. 28, No. 2 (1991) pp. 99–117
A statistical method, W. F. Stout's statistical test of essential unidimensionality (1990), for exploring the lack of unidimensionality in test data was studied using Monte Carlo simulations. The statistical procedure is a hypothesis test of whether ...
A FORTRAN Program for Assessing Unidimensionality of Binary Data Using Holland and Rosenbaum's Methodology
Multivariate Behavioral Research Vol. 28, No. 1 (1993) pp. 63–66
The methodology of P. E. Holland and P. R. Rosenbaum (1986) to assess unidimensionality of binary data is outlined and illustrated through a simulation with 36 items for 2,000 examinees. How to interpret the results is discussed. (SLD)
Applied Psychological Measurement Vol. 36, No. 1 (January 2012) pp. 60–63
The PROC NLMIXED procedure in Statistical Analysis System can be used to estimate parameters of item response theory (IRT) models. The data for this procedure are set up in a particular format called the "long format." The long format takes a...
Applied Psychological Measurement Vol. 35, No. 2 (March 2011) pp. 127–144
DETECT is a nonparametric methodology to identify the dimensional structure underlying test data. The associated DETECT index, "D[subscript max]," denotes the degree of multidimensionality in data. Conditional covariances (CCOV) are the building...
Investigating the impact of an integrated approach to the development of preservice teachers' technological pedagogical content knowledge (TPACK)
Computers & Education Vol. 71, No. 1 (February 2014) pp. 206–221
The purpose of this study is to describe an integrated pedagogical approach, aimed at advancing preservice teachers' learning on the use of technology and investigate its impact on participants' knowledge (i.e., TPACK) and practice. The integrated...
Journal of Educational and Behavioral Statistics Vol. 29, No. 2 (2004) pp. 177–200
A new procedure, CATSIB, for assessing differential item functioning (DIF) on computerized adaptive tests (CATs) is proposed. CATSIB, a modified SIBTEST procedure, matches test takers on estimated ability and controls for impact-induced Type 1 error ...