Compared performance of two polytomous item response theory models to that of the dichotomous three-parameter logistic model in equating tests composed of testlets using data from 6 tests of the Iowa Tests of Basic Skills (samples of 537 to 680 eighth graders). Results of the equating method based on polytomous models produced results that more…

Four equating methods were compared using four equating criteria: first-order equity (FOE), second-order equity (SOE), conditional mean squared error (CMSE) difference, and the equipercentile equating property. The four methods were: (1) three parameter logistic (3PL) model true score equating; (2) 3PL observed score equating; (3) beta 4 true…

For many reasons, students do not always perform on tests in ways that are congruent with their true abilities or achievement levels. Problems of this sort may be especially common on Title I evaluations where the tests administered are too difficult for a large percentage of the students. Such considerations raise the questions of whether…

Technical problems with norm-referenced achievement testing that can lead to the erroneous evaluation of schools for Chapter 1 Program improvement is discussed, and an alternative testing model is presented. The history of Chapter 1 testing and evaluation policies is briefly reviewed, and problems with the norm-referenced model are explored. Data…