The purpose of this study was to determine whether item difficulty is significantly affected by language difficulty and response set convergence. Language difficulty was varied by increasing sentence (stem) length, increasing syntactic complexity, and substituting uncommon words for more familiar terms in the item stem. Item wording ranged from…

Four methods for determining the dimensionality of a set of test items were compared: (1) linear factor analysis; (2) residual analysis; (3) nonlinear factor analysis; and (4) Bejar's method. Five artificial test data sets (for 40 items and 1500 examinees) were generated, consistent with the three-parameter logistic model and the assumption of…

The goal of test design is to devise an instrument that will provide a stable and accurate assessment of student ability in some area. One means of reaching this goal is through the use of latent trait models, which determine the relationship between the unobservable trait or ability and the observable test performance. Three common latent trait…

The purpose of this paper is to present two new alternative methods to the current goodness of fit methodology. With the increase use of computerized adaptive test (CAT), the ability to determine the accuracy of calibrated item parameter estimates is paramount. The first method applies a normalizing transformation to the logistic residuals to make…

The effects of a multidimensional latent trait space on estimation of item and person parameters by the computer program LOGIST are examined. Several item pools were simulated that ranged from truly unidimensional to an inconsequential general latent trait. Item pools with intermediate levels of prepotency of the general latent trait were also…

A review of the implications for the validity of the Scholastic Aptitude Test (SAT) of scientific developments accompanying the revival of cognitive psychology provides insights into the importance of such changes. A distinction can be made between a process-oriented or diagnostic test and an outcomes-oriented test such as the SAT. Since the SAT…

Although item bias statistics are widely recommended for use in test development and test analysis work, problems arise in their interpretation. The purpose of the present research was to evaluate the validity of logistic test models and computer simulation methods for providing a frame of reference for item bias statistic interpretations.…

At Santa Fe Community College, the development of a biology course and departmental final examination was accomplished in the following stages: (1) faculty reached consensus on course content, major objectives and sub-objectives; (2) faculty contributed final examination questions corresponding to the 10 major course topics to a pool for review…

A new approach to assessing unexpected differential item performance (item bias or item fairness) was developed and applied to the item responses of males and females to Scholastic Aptitude Test and Test of Standard Written English items administered operationally in December 1977. While the main body of the report describes the particulars of the…

Scales constructed under procedures and criteria outlined by the various traditional and latent trait methods were examined as to whether they varied in characteristics related to scale quality. Scales were constructed from a common pool of items analyzed in full form according to Likert and a one-parameter Rasch model for non-dichotomous data.…

In circumstances where judges are required to make ratings of performance, it is usually required to have two or more raters who are trained to agree on independent ratings of the same performance. It is suggested that such a requirement may produce the paradox of attenuation associated with item analysis, in which too high a correlation between…

A sample of slightly over 1,500 students from even-numbered grades in public schools of the U.S. Virgin Islands were given the 1973 edition of the Stanford Achievement Test (in grades 2, 4, 6, and 8) and the Test of Academic Skills (grades 10 and 12) in an attempt to assess student academic achievement in the basic skill areas of mathematics,…

The effects of item position on item statistics were studied in a large set of data from tests of word knowledge (WK) and arithmetic reasoning (AR). Position effects on item response theory (IRT) parameter estimates and classical item statistics were also investigated. Data were collected as part of a project to refine the Army's Computerized…

This study was designed to gather data on the meaning of imprecise terms from items written by physicians for their students and by test committees for national licensure and certification examinations. A total of 32 members of test committees who write examination items for various medical specialty examinations participated in the study. Each…

The three-parameter logistic model discussed was used by CTB/McGraw-Hill in the development of the Comprehensive Tests of Basic Skills, Form U (CTBS/U) and the Test of Cognitive Skills (TCS), published in the fall of 1981. The development, standardization, and scoring of the tests are described, particularly as these procedures were influenced by…