Describes a study in which an extensive fuzzy boundary was identified within the adult extension of two exemplary object-words, "dog" and "ball." It is argued that there has been an underestimation in previous research of the degree of correspondence that exists between child and adult extension. (33 references) (GLR)

A general approach is described for the analysis of categorical data when there are missing values on one or more observed variables. The method is based on generalized linear models with composite links. Situations in which the model can be used are described. (SLD)

Neural network technology was compared with simultaneous and stepwise linear discriminant analysis in terms of their ability to classify and predict persons (n=138) as having autism or mental retardation. The neural network methodology was superior in both classifying groups and in generalizing to new cases that were not part of the training…

Performed a reliability generalization using 244 studies that used NEO personality scales. Reliability estimates were given in only 15% of these studies, and 44% made no mention of reliability at all. Results suggest that many researchers have an inadequate understanding of concepts of reliability. Results also suggest that NEO personality scales…

Three experiments examined factors influencing whether young children consider function, as opposed to appearance or shape, when extending names of novel artifacts. Findings indicated that 4-year-olds extend names based on demonstrated function more often when that function provides a plausible causal account of perceptible object structure, when…

Studied sources of measurement error variance in the Teacher Efficacy Scale (TES) (Gibson and Dembo, 1984). Used reliability generalization to characterize the typical score reliability for the TES and potential sources of measurement error variance across 43 studies. Also examined related instruments for measurement integrity. (SLD)

The four reactions in the May 2005 issue of "The Counseling Psychologist" address several considerations regarding the use of structural equation modeling (SEM) in counseling psychology research, including its appropriateness for analyzing one's data and testing one versus multiple theoretical models. In addition, points that are not mentioned in…

Psychology is focused on variation between cases (interindividual variation). Results thus obtained are considered to be generalizable to the understanding and explanation of variation within single cases (intraindividual variation). It is indicated, however, that the direct consequences of the classical ergodic theorems for psychology and…

The authors provide generalizations of R. J. Boik's (1993) studentized maximum root (SMR) procedure that allow for simultaneous inference on families of product contrasts including simple effect contrasts and differences among simple effect contrasts in coherent analyses of data from 2-factor fixed-effects designs. Unlike the F-based simultaneous…

The present experiments investigate how young language learners begin to acquire form-based categories and the relationships between them. We investigated this question by exposing 12-month-olds to auditory structure of the form aX and bY (infants had to learn that a-elements grouped with Xs and not Ys). Infants were then tested on strings from…

This paper examines the question of whether there are useful general thinking skills. It offers a working definition of "thinking skill" and identifies ways in which this concept has been over-applied. Thinking skills, used across domains, are not inevitably weak as a result of the generality-power tradeoff. Admitting that thinking skills require…

In this note it is shown that the Moore-Penrose inverse of real 3 x 3 matrices can be expressed in terms of the vector product of their columns. Moreover, a simple formula of a generalized inverse is presented, which also involves the vector product.

Sometimes educators are puzzled by how students can demonstrate a social skill perfectly during a practice session in a social skills curriculum but fail to use the same skill in real-life situations. Students with a lack of social skills are more likely to experience teacher and peer rejection, and are more at risk for negative life outcomes,…

This study explores the predictive validity of GMAT[R] scores for predicting performance in graduate management programs outside the United States. Results suggest that the validity estimates based on the combination of GMAT[R] scores were about a third of a standard deviation higher for non-U.S. programs compared with existing data on U.S.…

The concept of symmetry is fundamental to mathematics. Arguments and proofs based on symmetry are often aesthetically pleasing because they are subtle and succinct and non-standard. This article uses notions of symmetry to approach the solutions to a broad range of mathematical problems. It responds to Krutetskii's criteria for mathematical…