This study examined differential item performance in the Progressive Achievement Tests for Mathematics (PAT Math) by both Pakeha (reference--majority) and Maori (focal--minority) students in New Zealand using both Item Response Theory (IRT) and non-IRT techniques. The PAT Math, a 50-item standardized test used in part to guide within class and…

A model for use in identifying assessment needs in association with teacher-made mathematics and science tests at the secondary level was developed. The model focuses on the identification and narrowing of discrepancies between teachers' perceptions of their testing practices and actual practice. All 19 math and 16 science teachers at a 4-year…

This study investigated the effect of diagram formats on performance on geometry items in order to determine whether certain examinees are affected by different item formats and whether such differences arise from the different intellectual demands made by these formats. Thirty-two experimental, multiple-choice geometry items were administered in…

Although perfectly scalable items rarely occur in practice, Guttman's concept of a scale has proved to be valuable to the development of measurement theory. If the score distribution is uniform and there is an equal number of items at each difficulty level, both the elements and the eigenvalues of the Pearson correlation matrix of dichotomous…

This paper discusses the use of latent class structure as a modelling framework for tests in which much of the data conforms to a relatively small number of systematic patterns. Application of this framework to the analysis of tests has been limited because available parameter estimation algorithms can only handle a relatively small number of…

Scores from the Stanford Achievement Tests administered to 50,000 students in Palm Beach County, Florida, were studied in order to determine whether the speeded nature of the reading comprehension subtest was related to inconsistencies in the score profiles. Specifically, the probable effect of random guessing was examined. Reading scores were…

Three item response models were evaluated for estimating item parameters and equating test scores. The models, which approximated the traditional three-parameter model, included: (1) the Rasch one-parameter model, operationalized in the BICAL computer program; (2) an approximate three-parameter logistic model based on coarse group data divided…

Comments are made on the review papers presented by six Dutch psychometricians: Ivo Molenaar, Wim van der Linden, Ed Roskam, Arnold Van den Wollenberg, Gideon Mellenbergh, and Dato de Gruijter. Molenaar has embraced a pragmatic viewpoint on Bayesian methods, using both empirical and pure approaches to solve educational research problems. Molenaar…

A primary goal of this study was to determine the extent to which item difficulty was related to item position and, if a significant relationship was found, to suggest adjustments to predicted item difficulty that reflect differences in item position. Item response data from the Medical College Admission Test (MCAT) were analyzed. A data set was…

This paper reviews the basic elements of the EM approach to estimating item parameters and illustrates its use with one simulated and one real data set. In order to illustrate the use of the BILOG computer program, runs for 1-, 2-, and 3-parameter models are presented for the two sets of data. First is a set of responses from 1,000 persons to five…

This study was designed to illustrate the use of the Rasch model procedure to equate the Dade County Compensatory Education Skills Test (DCCEST) to the State Student Assessment Test (SSAT) for both mathematics skills and communications skills. The SSAT was a test developed by the Florida State Department of Education to measure students' level of…

The development of the emerging technology of item writing was motivated in part by the desire to reduce potential subjectivity and bias between different item writers who attempt to construct parallel achievement tests. The present study contrasts four test forms constructed by the combined efforts of six item writers using four methods of item…

This study used classical psychometric, latent trait, and nonparametric approaches to analyze 13- and 14-item scales of English language proficiency. Tests of English listening comprehension (dictation) and reading ("copytest") were constructed by modifying the standard dictation testing procedure to create items of text segments which…

Prompted by the increased use of behavior rating instruments in educational environments and evidence of confusion over the interpretation of labels designating behavior clusters, the present two-phase study analyzed 410 specific items contained in seven behavior rating instruments and investigated whether these items could be intuitively sorted…

The reading comprehension (RC) and sentence completion (SC) items from four forms of the Scholastic Aptitude Test (SAT) verbal sections were examined for differential item functioning (DIF) between male and female examinees. Forms 1, 2, 3, and 4 of the SAT-verbal were administered in January 1983, January 1984, October 1984, and June 1986,…