For the six available sets of empirical data, the discrimination (slope) parameter of the logistic item characteristic curve was found to have a significant positive correlation over items with the difficulty (location) parameter. This unpleasant situation can be eliminated by a suitably chosen transformation of the ability scale. (Author/RC)

Factor analysis is the traditional method for studying the dimensionality of test data. However, under common conditions, the factor analysis of tetrachoric correlations does not recover the underlying structure of dichotomous data. The purpose of this paper is to demonstrate that the factor analyses of tetrachoric correlations is unlikely to…

A procedure for in-depth analysis of a limited number of tests being considered for selection by a school, district, project, or state personnel is described. This procedure involves listing the objectives that it would be desirable to measure determining the relative importance of each of these objectives, having "judges" match test items to…

The purpose of this study was to determine if correlations among student ratings items designed to be diagnostic could be lowered through use of special instructions to raters. The authors argue that the lowering of inter-item correlations is indicative of a reduction of the halo effect which leads to greater item diagnosticity. The experimental…

A computerized flexilevel test was implemented and its ability estimates were compared with those of a Bayesian estimation based computerized adaptive test (CAT) as well as with known true ability estimates. Results showed that when the flexilevel test was terminated according to Lord's criterion, its ability estimates were highly and…

Covariance structure modelling is applied to the problem of estimating reliability and measurement error in survey data. To provide a basis for grouping certain question or variable types (data from questions), a simple typology based on the formal characteristics of the questions is outlined. From this classification, models for the different…

The construct of motivation toward school is vaguely defined. The Junior Index of Motivation (JIM Scale) is one of few instruments claiming validity in measuring motivation toward school among junior and semior high students. This study discusses the shortcomings of the JIM scale, and compares item and total score characteristics and correlates…

Chicano and Amerindian vocabulary scale responses from the Stanford-Binet (LM) and Wechsler Intelligence Scale for Children were item-analyzed for 1,009 subjects. The response patterns differed both by ethnic group and test, as well as by age. The most common, and recurring, pattern found was "level-of-difficulty" gradient…

The reliability and the predictive and concurrent validity of the MATAP were investigated with the implicit goal of improving the prediction of course grades in the College of Fine and Applied Arts. It was found that reliability and validity coefficients were low, and it was suggested that the scoring system was a source of error variance. (MS)

Gumpgookies, an objective-projective test of school achievement motivation for children 3 1/2 to 8 year, was reduced from 100 to 75 items following extensive factor analyses. This revised test attempted to dissipate the effects of response sets of the subjects and was prepared in three versions--an individual form, a group form for non-readers,…

This research, conducted for California State Department of Education, is one component of a feasibility study focusing on ways to make the testing process more efficient by application of multi-purpose tests (MPT). MPT are designed, administered and scored to serve more than one purpose and to consolidate and unify testing programs as a partial…