An error in an essential equation within the article by Williams and Zimmerman is corrected, and the algebraic inequalities are translated into questions a researcher can ask about simple or residualized difference scores. Williams and Zimmerman acknowledge the error and note that main conclusions are not affected. (SLD)

Maximized correlation as an internal reliability estimate for tests with few items was investigated. An actual sampling distribution of maximum correlation--"r" max--was empirically derived from 100 samples of 50 cases each from Rorschach test data and compared with those of alpha and an odd/even split, using 2,020 Rorschach protocols.…

Previous studies have examined the reliability of scores derived from various Stroop tasks. However, few studies have compared reliability of more recently developed Stroop variants such as emotional Stroop tasks to standard versions of the Stroop. The current study developed four different single-stimulus Stroop tasks and compared test-retest…

To help teachers develop an awareness of how they structure a discussion, an instrument was constructed called the Assessment of Classroom Interaction Dynamics (ACID). Two expert judges and 26 trainees then participated in a study (1) to estimate interrater reliability between expert judges in the use of the ACID, (2) to assess the validity of the…

Against a shifting set of assessment preferences in the US regarding whether educational assessment should continue to be a states rights game or become a federally dominated undertaking, the publication of five first-rate analyses about England's national curriculum assessment (NCA) is particularly propitious. Taken together, these five papers…

IN THIS REPORT THE UNITED FEDERATION OF TEACHERS (UFT) ANALYZES SPECIFIC DATA FROM THE CENTER FOR URBAN EDUCATION'S (CUE) NEGATIVE EVALUATION OF NEW YORK CITY'S MORE EFFECTIVE SCHOOLS (MES) PROGRAM AND CHARGES THAT CUE'S CONCLUSIONS ARE INVALID. THE UFT MAINTAINS THAT SINCE 18 OF THE 21 MES WERE FORMER SPECIAL SERVICE (SS) SCHOOLS, CUE SHOULD HAVE…

The benefits of item response theory (IRT) will only accrue to a testing program to the extent that model assumptions are met. Obtaining accurate item parameter estimates is a critical first step. However, the sample sizes required for stable parameter estimation are often difficult to obtain in practice, particularly for the more complex models.…

This study was a preliminary step in gathering reliable data on suicides and suicide attempts in Padua, Italy. Data were collected from the first aid department of the Padua general hospital, 67 general practitioners in the city, staff of a night-time and holiday home-call medical service, the reanimation department of the Padua general hospital,…

A major deficiency in classical test theory is the reliance on Pearson product-moment (PPM) correlation concepts in the definition of reliability. PPM measures are totally insensitive to first moment differences in tests which leads to the dubious assumption of essential tan-equivalence. Robinson proposed a measure of agreement that is sensitive…

Definition of the issues to the use of latent trait models, specifically one- and three-parameter logistic models, in conjunction with multi-level achievement batteries, forms the basis of this paper. Research results related to these issues are also documented in an attempt to provide a rational basis for model selection. The application of the…

An easy-to-use plan that offers the accuracy and objectivity of statistics without the complexities is described. The plan is an adaptation of a general statistical procedure called the Median Test. The 10-step computation of the Median Test is given. An appendix discusses the "median." (DB)

The Heath and Carter approach to determining somatotypes is less accurate than is regression analysis, mainly because of the lack of association between skeletal widths and lean body mass as measured by body density and whole-body fat percentage, holding constant muscle circumference. (Author)

A procedure is developed for estimating correlations among new tests when non-overlapping sub-samples each are administered a different new test and all sub-samples are administered a set of standard tests. (JKS)

A rederivation of Lord's formula for estimating variance in multiple matrix sampling is presented as well as the ways Cronbach's coefficient alpha and the Spearman-Brown prophecy formula are related in this context. (Author/JKS)

A relatively reliable and valid hierarchy of clusters of objects is plotted from the highest column entries, exclusively, of a matrix of interassociations between the objects. Having developed out of a loose definition of types, the method isolates both loose and highly definitive types, and all those in between. (Author/RC)