Sixteen measures of reliability for two-category nominal scales are compared. Upon correcting for chance agreement, there are only five distinct indices: Fleiss's modification of A-sub-1, the phi coefficient, Cohen's kappa, and two intraclass coefficients. Recommendations for choosing an agreement index are made based on definitions, magnitude,…

This study, which measures the growth rates of the 25 largest ARL libraries from 1962-63 through 1973-74, tentatively identifies the collection size level past which growth-rate deceleration begins. (Author)

The article focuses on a specific method of constructing the concept of function. The core of this method is a didactic model that plays two roles together--on the one hand a role of a model of the concept of function and on the other hand a role of a model of physical phenomena that functions can represent. This synergy of modeling situations and…

In this workshop, we will continue to reflect on a models and modeling perspective to understand how students and teachers learn and reason about real life situations encountered in a mathematics and science classroom. We will discuss the idea of a model as a conceptual system that is expressed by using external representational media, and that is…

This book is combined with a Web site to allow the reader to acquire the basic concepts of item response theory without becoming enmeshed in the underlying mathematical and computational complexities. The first edition, with its accompanying software, was designed to give the reader access to the basic concepts of item response theory without…

Computer Algebra Systems (CAS) can be used to help understand the behavior of cubics and other families of curves. The analysis of the parameters associated with a family of curves can give insight into the behavior of the family and can be used within the context of a mathematical model to determine a policy for the implementation of the model in…

The concepts of quantitative and structural change are considered from a multivariate perspective. A hybrid of these two types of change, quantistructural change, is described. (CS)

Though unshelved books are a problem in every library, little systematic effort has been made to design an optimal solution. Presented here is a mathematical model that attempts to approach such a solution. (2 references) (Author/DH)

How far does the back end of a bus swing out as the driver makes a turn at an intersection?'' is the problem discussed. (MM)

A mathematical definition of an information network is constructed with the purpose of developing a theory useful in answering practical questions concerning information transfer. (10 references) (Author)

System for measuring updating process in conjunction with psychological and environmental effects. (IR)

Investigates implications for finite and known item populations for classical test theory, and the alpha coefficient among items in paper-and-pencil testing. (Author/AG)