The problem of comparing proportions when some data are missing is investigated, and determination is made of what statistical techniques are appropriate under each of several probability models describing the observations likely to be missing. Monte Carlo methods were used to investigate the properties of standard estimators under each of the…

A method for estimating power scores is described. By way of illustration, it is applied to 21 students who were improperly timed on a standard test. Some empirical results are given in support of the estimation procedure. (Author)

The author reviews and evaluates the principal theoretical measures of attention categorized in three areas: self-report measures, operant behavioral measures, and psychophysiological measures. Self-report measures include a variety of rating scales, interest and attitude scales, Krugman's "number of 'connections,'" and program audience analyzers.…

Recent years have seen many attempts to program learning based on many principles ranging from intuition to mathematics. The area of criterion establishment for advancement or conversely additional training at the same or lower levels remains primarily in the realm of intuition. The intuition used is only as good as the experience and background…

This document dates from 1966 and is thought to be primarily useful in allowing the reader to trace the evolution of this model from its earlier stages to completion. M.E.T.R.O. is a gaming simulation which uses techniques of war gaming as a tool for coping with current and anticipated urban problems. At this stage in its conception, M.E.T.R.O.…

Learning hierarchies are networks of prerequisite relationships of instructional objectives. Seven measures of the validity of learning hierarchies were compared for their ability to identify correctly- and incorrectly-ordered hierarchies. A computer simulation model was used to generate stochastic data of known underlying structure. Analysis of…

Two basic issues are discussed that involve the Carver model of the relationship between test score and knowledge. The first of these concerns different types of tests which have different probabilities of obtaining the correct answer due to guessing. A derivation is shown which places different test types "on-a-par"--meaning that two tests are…

Since the primary purpose of classical testing is to rank order examinees consistently, the absolute value of the true score has been relatively unimportant. However, the major purpose of criterion referenced testing is to estimate the true capabilities of examinees to perform specific tasks. Hence, the problems of true score determination assume…

The paper presents an econometric analysis of the impact of the Work Incentive Program, as modified by the Talmadge Amendments of 1971 (WIN 2), on Aid to Families with Dependent Children (AFDC) program costs and recipient rates. (Author)

By considering colors as sets of wavelengths and using Boolean Algebra of sets, the effects of combining colors can be represented in a formal mathematical system. (SD)

Points out that man and his institutions must be far-sighted and make sacrifices now to benefit future species and to preserve the environment. (LS)

This is the second of several papers which attempts to introduce group representation theory to students of molecular or solid-state physics in as intuitive and simple a fashion as possible. (Author/BB)

A new method for separating affective and denotative meaning subsystems in semantic differential ratings of any homogeneous concept domain is developed and illustrated using personality ratings data. Possible applications of this method are discussed. (Author/JKS)

Two simple quantitative models were derived from a series of experiments which explored the role of information storage in working memory when performing mental arithmetic. The decay model is a tractable analysis of a complex task which assumes a decay process in working storage. Similar analyses are recommended for problem solving activities…

Tree searching was applied as a computer model of simple addition sentences. Results indicated that the number of problem reductions performed in tree searching accounted for most of the variance across problems in student error rate and solution time. The technique constitutes a computer test for the adequacy of a problem solving prescription.…