This study analyzes the effects that state licensing requirements have had on barber supply and on new entrants into the trade over the period 1969-1973. The authors found that the minimum education requirements, barber school hours required, and months of apprenticeship required have had little or no significant effect. (MF)

The effect of performance evaluations on expectations for future performances is studied using an extension of a Bayesian model. Whereas the model was originally limited to the cases where person C is both an actor and an observer, in the present extension these become particular cases of the model. (Author/RD)

Sets of randomly generated numbers are used to produce simulated data sets to illustrate that high heritability of a property within each of two populations may be consistent with a vanishingly small heritability in the combined population. (A response by Jensen appears in the next issue of Journal of Educational Statistics, p.385). (CTM)

Identifies difficulties of using microcomputer-based systems as surrogate teachers and some benefits from their appropriate use in partnership with the teacher. Uses considered include application program, simulation program, drill and practice, tutorial program, computer modeling, and administration program. (JEG)

Examines through a series of mathematical models (theorems, descriptions, and examples), properties and operations on inverted files, which are used in an information retrieval system based on thesaurus with weighted descriptors. (CWM)

Discussed is the virial theorem, which is useful in classical, quantum, and statistical mechanics. Two types of derivations of this theorem are presented and the relationship between the two is explored. (BT)

The review indicates that refined measures of the family environment and the use of complex statistical models increase the understanding of the relationships between socioeconomic status, sibling variables, family environment, and cognitive development. (RC)

Examines the effect on earnings of variations among individuals in postschool human investment (namely, in work experience after the completion of schooling). Data from the Johns Hopkins Retrospective Life History Survey are analyzed to make possible a reformulation of Becker and Chiswick's econometric model to allow for additional variations…

Discusses a simple technique for stochastic resource planning that, when computerized, can assist educational managers in the process of quantifying the future uncertainty, thereby, helping them make better decisions. The example used is a school lunch program. (Author/IRT)

Provides details of a study that attempts to broaden the understanding of mathematics by investigating how applied mathematicians and biologists collaborate in developing dynamic population models. (DDR)

Describes a computer application called HyperGami that permits users to design, explore, decorate, and study a variety of paper polyhedral models. Discusses the HyperGami interface and language, illustrates the construction of customized polyhedra, and describes results of middle school students' experiences using the system. (Author/AIM)

Presents two case studies of learners attempting to understand the concept of normal distribution, specifically why physical phenomena such as height fall into normal distributions. Draws conclusions about a Connected Mathematics learning environment that enables confrontation with epistemological anxiety and the features of modeling languages…

Explains a proposed block of instruction that would give students in industrial engineering, operations research, systems engineering, and applied mathematics the basic understanding required to begin more advanced courses in simulation theory or applications. (DDR)

Investigates the thinking process underlying students' improper linear reasoning and how this process is affected by their mathematical conceptions, beliefs, and habits. Explores the actual process of problem solving from students falling into the linearity trap and the mechanism behind it. Discusses specific mathematical conceptions, habits, and…

Describes the process of mathematical modeling, an extensive teacher's guide, and a student modeling activity to improve the efficiency of soft-drink packaging. (KHR)