Discusses the objectives of the study of Economics, which include anticipating future events and explaining current developments. The article points out that an acquaintance with past economic developments enhances the ability to predict the future. Research into the reasons for economic events often can uncover the multiple causes of a given…

Presents: "Prices of United States and Foreign Published Materials"; "Book Title Output and Average Prices"; "Book Sales Statistics, 1998"; "United States Book Exports and Imports: 1998"; "International Book Title Output: 1990-96"; "Number of Book Outlets in the United States and Canada";…

We consider power calculation in structural equation modeling with data missing completely at random (MCAR). Muth?n and Muth?n (2002) recently demonstrated how power calculations with data MCAR can be carried out by means of a Monte Carlo study. Here we show that the method of Satorra and Saris (1985), which is based on the nonnull distribution of…

A number of important applications require the clustering of binary data sets. Traditional nonhierarchical cluster analysis techniques, such as the popular K-means algorithm, can often be successfully applied to these data sets. However, the presence of masking variables in a data set can impede the ability of the K-means algorithm to recover the…

The power output achieved at peak oxygen consumption (V[O.sub.2]peak) and the time this power can be maintained (i.e., Tmax) have been used in prescribing high-intensity interval training. In this context, the present study examined temporal aspects of the V[O.sub.2] response to exercise at the cycling power that output well trained cyclists…

This study examined the access of books among six communities in the greater Los Angeles area: Brentwood, Beverly Hills, South Central, Watts, East Los Angeles, and Compton, participants included 60 students, ages 7 to 12 years, selected from each community. The survey examined access to books in the home, classroom library, school library and…

This article proposes an item exposure control method, which is the extension of the Sympson and Hetter procedure and can provide item exposure control at both the item and test levels. Item exposure rate and test overlap rate are two indices commonly used to track item exposure in computerized adaptive tests. By considering both indices, item…

This article reconsiders the issue of clinical versus statistical prediction. The term clinical is widely used to denote 1 pole of 2 independent axes: the observer whose data are being aggregated (clinician/expert vs. lay) and the method of aggregating those data (impressionistic vs. statistical). Fifty years of research suggests that when…

The purpose of this Information Aid is to alert school officials to changes and revisions in the Consumer Price Index (CPI), to familiarize them with differences between the former CPI and the new and revised indexes, to demonstrate how the U.S. Bureau of Labor Statistics (BLS) computes changes in the CPI, to indicate appropriate uses of the CPI,…

Written comments on student evaluations often seem idiosyncratic, lacking the power of numerical statistical data. These statements, however, may sometimes reveal intellectual challenges common to novice learners in our disciplines. Instructors can use these insights as part of a scholarly approach to teaching, making meaningful adjustments to…

When the American Council of Learned Societies held its annual meeting in Montreal last week, topics such as open access, scholarly publishing, and "The Global Academy and the Geography of Ideas" figured on the agenda. This article discusses the first item of business at the meeting: the debut of the Humanities Indicators project, with a first set…

This study set out to identify the kinds of achievement orientations that adolescents show, and to examine the kinds of antecedents and consequences the use of a particular orientation has. The participants were 734 Swedish adolescents (335 boys and 399 girls) who filled in questionnaires measuring their achievement beliefs and behaviors,…

The risk of investment in schooling has largely been ignored. We mimic the investment decision facing a student and simulate risky earnings profiles in alternative options, with parameters taken from the very limited evidence. The distribution of rates of return appears positively skewed. Our best estimate of "ex ante" risk in university education…

Issues 256 through 265 of "Fast Facts" from the Library Research Service present data collected from libraries in Colorado and throughout the nation. Topics addressed in these "Fast Facts" from 2008 include computer usage by public library patrons, Colorado summer reading programs, children's' use of public libraries, and the…

The Monitoring the Future (MTF) study is an ongoing series of national surveys of American adolescents and adults that has provided the nation with a vital window into the important, but largely hidden, problem behaviors of illegal drug use, alcohol use, tobacco use, anabolic steroid use, and psychotherapeutic drug use. For more than a third of a…