Six estimators of treatment effect when assignment to treatment groups is based on the covariate are compared in terms of empirical standard errors and percent relative bias. Results show that simple analysis of covariance estimator is not always appropriate. (Author/GK)

Guilford's structure of intellect model and an alternative model were compared using oblique and orthogonal factors. Using covariance structure analysis it was found that the fit of the oblique Guilford model was better than that of the alternative oblique model. (Author/RL)

An iterative procedure to obtain maximum likelihood estimates of latent structure analysis parameters is described. The procedure is defended against a critic (EJ 187 975) who contended that it would permit unacceptable estimates. (JKS)

The message of Proposition 13 appears to be a demand for smaller residential property tax burdens but not for a reduction in current service levels for most public sector activities. Available from Stanley J. Bowers, Executive Director, NTA-TIA, 21 East State Street, Columbus, OH 43215; sc $5.00. (Author/IRT)

Elaborates on distinctions between different formulations of taxpayer equity. First, taxpayer equity is examined from the school finance perspective, then notions of taxpayer equity that are more consistent with public finance views, but that can and have been applied to education, are introduced. (Author/IRT)

Assuming conditional normality and independence, standard estimation and hypothesis testing procedures for regression coefficients are the same whether using fixed x values, random x values or mixed fixed and random values. Contrary to Sockloff's suggestion, polynomial regression is useful with either fixed or random models. (See EJ 142 050). (CP)

A quantitative model is described for the optimal assignment of students to courses for their complete high school careers. Model-generated student schedules are found to be unfailing in their conformity to all the constraints of the test high school's curriculum. (Author/IRT)

A method is proposed for overcoming the problem of multicollinearity in multiple regression equations where multiplicative independent terms are entered. The method is not a ridge regression solution. (JKS)

There are two complementary approaches to conjoint measurement: axiomatic and numerical. In this article, synthetic data are used to examine how well axiomatic and conjoint measurement methods, individually and comparatively, recover parameters from data with three dimensions. (JKS)

A course in mathematical model-building is described. Suggested modeling projects include: urban problems, biology and ecology, economics, psychology, games and gaming, cosmology, medicine, history, computer science, energy, and music. (MK)

Mathematical models and their construction are discussed. Successful mathematical model building is suggested as requiring a combination of deductive thinking and an understanding of the external world. (MP)

A method is discussed for justifying to students the fact that the product of two negative integers is positive. (DT)

Examines the comparative efficiency of higher education institutions in the United Kingdom, responding to governmental concerns for accountability, value for money, and cost control. Tests concepts of cost and outcome efficiency, using data- development analysis, to gain further insights into universities' operations. Applying this methodology to…

Problems found in the application of structural equation modeling to the theory of reasoned action are explored, and an alternative model specification is proposed that improves the fit of the data while leaving intact the structural part of the model being tested. Problems and the proposed alternative are illustrated. (SLD)

Methods by which structural models correct for the effects of attenuation due to measurement error are reviewed, and implications of such disattenuation for interpreting the results of structural equation models are considered. Recommendations are made for improving the practice of disattenuation, and caution is urged in drawing inferences based…