The accuracy of trait estimates obtained from three vertical equating methods was examined. The procedures studied included two anchor test designs and a single-group design. Data from two content areas and two grade combinations were studied. A three-parameter logistic model was used to perform the equatings. The results obtained were used to…

Unidimensional item response theory (IRT) is widely used in the analysis and equating of educational achievement tests. If an IRT model is true, item response must be locally independent when the trait is held constant. Several measures of local dependence which are used in conjunction with the three-parameter logistic model in the analysis of…

In January 1982, the College Board and Educational Testing Service implemented a technical change in the procedures used to equate scores on the Scholastic Aptitude Test (SAT). For previous editions of the SAT, a linear equating procedure was used to establish the comparability of scores on different editions. Beginning in January 1982, this…

THIRTY-SIX COLLEGE FRESHMEN WERE MATCHED FOR MATH ABILITY AND RANDOMLY ASSIGNED TO AN EXPERIMENTAL AND CONTROL GROUP, TO WORK A 71-ITEM LINEAR PROGRAM IN SCRAMBLED AND ORDERED SEQUENCE, RESPECTIVELY. AN IMMEDIATE POST-TEST SHOWED THAT--ITEM SEQUENCE HAD NO SIGNIFICANT EFFECT ON LEARNING TIME, ERROR SCORE, TEST SCORE, OR TEST TIME. PRIOR MATH…

In order to determine the comparability of the IQ estimates and subtest scores on the Wechsler Intelligence Scale for Children (WISC) and the Wechsler Intelligence Scale for Children--Revised, both tests were adminstered in a four-cell counter-balanced design. Overlapping items were given only once. Subjects were 77 male and 51 female adolescents…

To determine if Rasch Model procedures have any utility for equating pre-existing tests, data from the equating phase of the Anchor Test Study (ATS) were reanalyzed. This management report summarizes the work completed in the project, describes the differences in this project and that of the ATS, and presents recommendations and conclusions to the…

The purpose of this investigation was to establish the effects of repeaters on test equating. Since consideration was not given to repeaters in test equating, such as in the derivation of equations by Angoff (1971), the hypothetical effect needed to be established. A case study was examined which showed results on a test as expected; overall mean…

Prior use of the equipercentile method of test equating was based on a graphic procedure which is tedious, subject to smoothing errors, and non-analytical. Recognition of the equipercentile method as a curve-fitting procedure for two cumulative percentage distributions leads to a proposed analytical solution to the problem through use of linear…

The Anchor Test Study provides a method for translating a pupil's score on any one of eight widely used standardized reading tests for Grades 4, 5, and 6 to a corresponding score on any of the other seven tests, as well as furnishing new nationally representative norms for each of the eight tests. In addition, the Study presents new estimates of…

This study examines a common set of equating items for their appropriateness to both American and Canadian populations and, to determine the equations for converting scores from the verbal and mathematical scales of the 1971 form of the Canadian Scholastic Aptitude Test (the future standard continuing scales of the CSAT) to the corresponding…

Rasch model equatings of multilevel achievement test data before and after the deletion of misfitting persons were compared. Rasch equatings were also compared with an equating obtained using the equipercentile method. No basis could be found in the results for choosing between the two Rasch equatings. (Author/LMO)

Three professional associations, the American Educational Research Association, the American Psychological Association, and the National Council on Measurement in Education, jointly adopted the new "Standards for Educational and Psychological Testing" in 1985. The relationship of these to earlier standards is reviewed, and implications…

A procedure is proposed for determining whether correlations obtained between two measures justify the assumption that the measures are identical. It is intended especially for small samples. In the example, the performance scales of two intelligence tests were administered to 32 deaf adolescents. (GDC)

One of the most challenging issues a state must resolve in designing a statewide standards and college readiness assessment is that of how student scores should be reported. The ACT is an effective and reliable measure of student readiness for college and work, but in some cases states may wish to augment the ACT with tests of their own design. In…

This study explores the relative merits of a potentially useful item response theory (IRT) linking design: using a single set of anchor items with fixed common item parameters (FCIP) during the calibration process. An empirical study was conducted to investigate the appropriateness of this linking design using 6 groups of students taking 6 forms…