Scores from tests in the same battery are put on scales which are the "same" in some sense, so that certain interpretations are made easier. This is often done when scores for different tests are obtained on different population segments, especially such as newer, more varied batteries of test offerings. It is felt that traditional erroneous…

The effects of repeaters (testees included in both administrations of two forms of a test) on the test equating process are examined. It is shown that repeaters do effect test equating and tend to lower the cutoff point for passing the test. (JKS)

Use of the Rasch model for vertical equating of tests is discussed. Although use of the model is promising, empirical results raise questions about the adequacy of the Rasch model. Latent trait models with more parameters may be necessary. (JKS)

A new formula for the correction for chance success due to guessing was advanced and investigated, the mathematical solution of which has the property of equating the scores of fast and slow examinees of equal ability. (Author/JKS)

It was predicted that there would be variable IQ discrepancies at different ages because of differential age adjustments on the norms of the Wechsler Adult Intelligence Scale (WAIS) and the WAIS-Revised (WAIS-R). The use of equivalent WAIS and WAIS-R sums of scaled scores demonstrated the predicted variable discrepancies. (Author/BW)

Tau-equivalence means that two tests produce equal true scores for individuals but that the distribution of errors for the tests could be different. This paper examines the effect of performing equipercentile equating techniques on tau-equivalent tests. (JKS)

Traditionally, error in equating observed scores on two versions of a test is defined as the difference between the transformations that equate the quantiles of their distributions in the sample and in the population of examinees. This definition underlies, for example, the well-known approximation to the standard error of equating by Lord (1982).…

This paper summarizes some of the basic concepts in test equating. Various types of equating methods, as well as data collection designs, are outlined, with attempts to provide insight into preferred methods and techniques. Test equating describes a group of methods that enable test constructors and users to compare scores from two different forms…

A study was conducted of the feasibility of establishing an equivalency scale that would enable commercial state tests to be linked to one another and to the National Assessment of Educational Progress (NAEP). In evaluating the feasibility of linkages, the study committee focused on the linkage of various fourth-grade reading tests and the linkage…

Four equating methods were compared using four equating criteria: first-order equity (FOE), second-order equity (SOE), conditional mean squared error (CMSE) difference, and the equipercentile equating property. The four methods were: (1) three parameter logistic (3PL) model true score equating; (2) 3PL observed score equating; (3) beta 4 true…

The purpose of this study was to equate two standardized English as a Second Language (ESL) proficiency tests, the New York State Placement Test (NYSPT) and the Combined English Language Skills Assessment (CELSA), with the Mainstream English Language Training (MELT) project Student Performance Levels (SPLs) in order to facilitate the reporting of…

Statistical procedures for detecting differential item functioning (DIF) are often used as an initial step to screen items for construct irrelevant variance. This research applies a DIF dissection method and a two-way classification scheme to SAT Reasoning Test™ verbal section data and explores the effects of deleting sizable DIF items on reported…

This paper demonstrates how the problem of calibrating measures can be formulated in terms of confirmatory factor analysis. The relationships between traditional approaches and a confirmatory factor approach are specified. (Author/CTM)

Some of the measurement issues encountered in the equating of performance assessments designed for use in teacher certification decisions are described. Analytic strategies based on examinee data that involve modification of existing procedures and judgmental strategies involving the judgments of experts to determine score equivalence are also…

Two observed-score methods that assume equally reliable congeneric tests were compared for the external anchor test equating model. Each derivation was compared to existing test equating methods based on different assumptions. Using samples of Australian secondary school students (N=about 6,000), the methods were compared empirically with existing…