The author's previously developed theory on income distribution, in which two of the explanatory variables are the average level and the distribution of education, is refined and tested on data selected and processed by the author and data from three studies by Americans. The material consists of data on subdivisions of three countries, the United…

Six models for evaluating change are examined via a Monte Carlo study. All six models show a lack of power. A modified analysis of variance procedure is suggested as an alternative. (JKS)

The Head Start data analyzed by Magidson (1977) were reanalyzed using Joreskog's (1976) LISREL computer program methodology. The hypothesis that the Head Start program produced zero effects on the cognitive abilities of its participants was evaluated by several Chi Square tests. In all cases, the null hypothesis could not be rejected. (Author/CTM)

In a reply to the previous article (TM 503 435), Magidson disparages the arbitrary application of the .05 significance level to these data, responds to several assertions, and provides additional data in support of his original article showing positive effects for Project Head Start. (CTM)

The definition of hierarchical structure is reviewed, together with psychometric and experimental evidence regarding the existence of specific structures. A mathematical model including hierarchical and nonhierarchical options for a two component task is presented, along with an experimental design appropriate for testing the model and related…

To correct for measurement error in the correlation of student status with achievement gain, the simplex model was used. Results supported the authors' hypothesis that status and gain are correlated. Students who start out as low achievers may need more help over time to maintain the same academic growth as higher achievers. (Author/MV)

Presents a model which provides a theoretical framework for conducting research regarding the determinants of a professional's intention to participate in continuing education. The framework's three components are the professional's (1) attitude toward participation, (2) perception about what significant others think about his or her…

Presents a model of college entrance that focuses on the influences of public policy and the economic environment, and the interaction of these factors with student ability and parental income. (TA)

In the context of pass/fail decisions, using the Bock multi-nominal latent trait model for moderate-length tests does not produce decisions that differ substantially from those based on the raw scores. The Bock decisions appear to relate less strongly to outside criteria than those based on the raw scores. (Author/JAZ)

Giving patterns in the six years following a stock market drop in 1960 showed that giving actually went up during those years. However, in the case of very wealthy donors, they reduced large gifts to colleges. ( MLW)

Two experiments employed story telling to investigate whether production is adapted to comprehension. Subjects were more likely to specify instruments from stories if the instruments were atypical or important to the story. A mathematical model proposed that instrument concepts may be selected at three stages in the production process. (Author/LMO)

In this paper a Bayesian procedure is developed for the simultaneous estimation of the reading ability and difficulty parameters which are assumed to be factors in reading errors by the multiplicative Poisson Model. According to several criteria, the Bayesian estimates are better than comparable maximum likelihood estimates. (Author/JAZ)

Two easily computed test statistics are proposed for testing the equality of two correlated proportions when some observations are missing on both responses. The performance of these tests in terms of size and power is compared with other tests by means of Monte Carlo simulations. (Author/BS)

A meta analysis of preschool intervention programs is performed to arrive at an overall effect size of such programs. Results indicate that despite the diversities in intervention sites, ages of subjects, lengths of intervention, and curricula models, there is a positive homogeneous effect on the variables. (Author/LMO)

Standard maximum likeliheed estimation was compared using two forms of robust estimation, BIWEIGHT (based on Tukey's Biweight) and AMTJACK (AMT-Robustified Jackknife), and Rasch model person analysis. The two procedures recovered the generating parameters, but Rasch person analysis also helped to identify the nature of a response disturbance. (GDC)