In this study, we investigated gender and minority achievement gaps on 8th-grade science items employing a multilevel item response methodology. Both gaps were wider on physics and earth science items than on biology and chemistry items. Larger gender gaps were found on items with specific topics favoring male students than other items, for…

The stability was evaluated of a partial correlation index, comparisons of item characteristic curves, and comparisions of item difficulties in assessing race and sex differences in the performance of verbal items on the Graduate Record Examination Aptitude Test. All three indexes exhibited consistency in identifying the same items in different…

Two psychometric approaches for the investigation of item bias were employed to examine the performance of four sociocultural groups on six subtests of the Wechsler Intelligence Scale for Children - Revised (WISC-R). The sample of 950 students was from Pima County, Arizona. One approach involved the comparison of the psychometric indices of…

Latent trait theory is used as a basis for a definition of item bias, and an experiment is described in which a test of vocabulary items was not found to be biased when administered to two groups of high school students, one group of 58 black students and the other 168 white students. The experiment for the detection of bias began with separate…

The agreement between the Educational Testing Service (ETS) and the Golden Rule Insurance Company of Illinois is interpreted as setting the general principles on which items must be selected to be included in a licensure test. These principles put a limit to the difficulty level of any item, and they also limit the size of the difference in…

A comparative study of item analysis was conducted on the basis of race to determine whether alternative test construction or processing might increase the proportion of black enlisted personnel among those passing various military technical knowledge examinations. The study used data from six specialists at four grade levels and investigated item…

Responses to American College Test College Outcome Measures Program (ACT-COMP) items by 481 black and 9,237 white students at the University of Tennessee (Knoxville) were analyzed using F. Samejima's graded model to determine the level of differential item functioning (DIF). Students had been tested using Form 8 of the ACT-COMP objective test…

In order to look for evidence of possible racial bias in six of the Navy tests for the Enlisted Advancement System, statistical data for a group of black personnel were compared with data for a selected matching group of whites. The first step was to compute item difficulty indices (the percent passing each item) for the black group, for the…

Four problems faced by the staff of the California Assessment Program (CAP) were solved by applying Rasch scaling techniques: (1) item cultural bias in the Entry Level Test (ELT) given to all first grade pupils; (2) nonlinear regression analysis of the third grade Reading Test scores; (3) comparison of school growth from grades two to three, using…

The relationship of differential item functioning (DIF) to item difficulty on the Scholastic Aptitude Test (SAT) was examined, based on data from nine recent administrations of the test from June 1986 through December 1987. This pool of information includes item statistics on 765 verbal and 540 mathematical items computed for subgroups of White,…

Four simulated mathematical and verbal test forms were produced by test assembly procedures proposed in legislative bills in California and New York in 1986 to minimize differences between majority and minority scores. Item response theory analyses of data for about 22,000 black and 28,000 White high-school students were conducted. (SLD)