Two models for psychological distances, the hierarchical clustering model and the multidimensional Euclidean model, are compared to see how they relate to each other. (Author/RK)

An actual application of linear graphs is described. (MM)

A teacher's notes of ideas on how to teach decimals and what everyday examples to use. For part 1 of this article, see volume 2, number 3, pages 23-24. (MM)

A duplicate of this article is in The Mathematics Teacher, November, 1972. For the abstract see se 506 987. (DT)

The orderly increase in the proportion of subjects who make optional reversal shifts over an age scale that now encompasses a range from 3 to 18 is confirmed. (Authors)

It is shown that in the special case of just two criterion groups the predictor variables may be equivalently ordered (with respect to contribution to prediction or discrimination) by the univariate F-ratios and by estimates of the predictor versus the linear discriminant function correlations. (Author)

Contributes to a better understanding of operations research (OR) as it can be applied in educational research and planning. Following definitions of OR and educational planning, a brief overview of a general decision model used in OR studies is presented. (Author/DN)

Ford's procedure is likely to be useful whenever one wants to achieve a single rank order by combining data obtained from multiple judges'' who have placed objects'' into ordered categories. (Authors)

Authors conclude that, in the world of real data sample correlation matrices, Guttman's stronger lower bound is not of practical use in determining the effective number of common factors. (Authors/CB)