Presented at the national conference for AERA (American Educational Research Association) in April 2009. The large variability of SAT taker population across states makes state-by-state comparisons of the SAT scores challenging. Using a mixture modeling approach, therefore, the current study presents a method of identifying subpopulations in terms…

The benefits of item response theory (IRT) will only accrue to a testing program to the extent that model assumptions are met. Obtaining accurate item parameter estimates is a critical first step. However, the sample sizes required for stable parameter estimation are often difficult to obtain in practice, particularly for the more complex models.…

The effects of anchor test characteristics in the accuracy and precision of test equating in the "common items, nonequivalent groups design" were studied. The study also considered the effects of nonparallel based and new forms on the equating solution, and it investigated the effects of differential weighting on the success of equating…

ACT college test publisher provided scores. On average, non-homeschoolers performed better than homeschoolers, by about two items, out of sixty items, on the ACT mathematics test that was analyzed. This result may be due to the different teaching/learning media used in teaching each of the two groups, to different teacher/student interaction, or…

The State of Florida Department of Education provides pre-and-post-graduation data for public high school graduates throughout Florida. These data were used for the present report to produce data sets for all M-DCPS regular high schools and charter high schools graduating students in 2009 and 2010. Summary data for the district are also provided.…

The primary concern or focus of a certification or licensure test is to obtain valid criterion-referenced information regarding a candidate's competence to practice. When the test is administered by computer, a valid pass/fail decision can be made with fewer items than an equivalent paper/pencil test by targeting items at the passing score and…

An optimization model is presented that allows test assemblers to control the shape of the observed-score distribution on a test for a population with a known ability distribution. An obvious application is for item response theory-based test assembly in programs where observed scores are reported and operational test forms are required to produce…

This paper presents an information processing model of test anxiety in an attempt to explain the mechanism of test anxiety's effect on working memory within the framework of the American College Testing Program Assessment (ACT). The model suggests that the construct of test anxiety, both worry and emotionality, is represented in the declarative…

This study examined the usefulness of applying the Rasch rating scale model (D. Andrich, 1978) to high school grade data. ACT assessment test scores (English, Mathematics, Reading, and Science) were used as "common items" to adjust for different grading standards in individual high school courses both within and across schools. This…

This study examined the usefulness of applying the Rasch rating scale model (D. Andrich, 1978) to high school grades. ACT Assessment test scores (English, Mathematics, Reading, and Science Reasoning) were used as "common items" to adjust for different grading standards in individual high school courses both within and across schools.…

The State of Florida Department of Education provides pre-and-post-graduation data for public high school graduates throughout Florida. These data were used for the present report to produce data sets for all M-DCPS regular high schools and charter high schools graduating students in 2008 and 2009. Summary data for the district are also provided.…

Effects of passage and item-scrambling on equipercentile and item-response theory equating were investigated using 2 scrambled versions of the American College Testing Program Assessment for approximately 25,000 examinees. Results indicate that using a base-form conversion table with a scrambled form affects the individual examinee level. (SLD)

This study attempted to control differences in achievement when examining omitting tendencies of examinees. Test data of randomly sampled examinees (7 samples of 2,000 examinees each) from one national administration of the ACT Assessment were used. The number of responses omitted per examinee was examined over all examinees and over only those…

This report builds on and extends existent research on population invariance to new tests and issues. The authors lay the foundation for a deeper understanding of the use of population invariance measures in a wide variety of practical contexts. The invariance of linear, equipercentile and IRT equating methods are examined using data from five…

Guidelines for test item-writing have traditionally recommended making the correct answer of a multiple-choice item grammatically consistent with its stem. To investigate the effects of adhering to this practice, certain item formats were designed to determine whether the practice of providing relevant grammatical clues, in itself, created cue…