Trajectories of Gambling During Adolescence

This study aimed at empirically identifying groups of adolescents with distinct longitudinal trajectories of gambling involvement and validating these groups by comparing them with respect to correlates. 903 low SES boys were followed annually from age 11 to 16 years. Three groups were found: an early-onset high-level chronic group, a late-onset high-level group, and a low gambler group. The Chronic group and the Low group consistently differed on teacher-rated inhibition (i.e., anxiety) during childhood and early adolescence. They also differed on concurrent teacher and self ratings of disinhibition (i.e., impulsivity), while the Late Onset group appeared to lie in between these groups. Compared to the Low group, both high groups subsequently had elevated scores on later gambling related problems.     

Vital connections

Scientists are currently exploring the structure and behavior of complex biological systems, which consist of networks of interacting entities. A recent paper in Proceedings of the Royal Society of London Series B Biological Sciences describes the distinctive characteristics of aging-related proteins in the yeast protein-protein interaction network. In this Perspective, I discuss the implications of these findings for longevity research.     

Walking a tightrope: Dilemmas of participant observation of groups in conflict

This article addresses issues that develop in the conduct of comparative participant observation research. The two groups in which the authors became involved as participant observers were the Unification Church of the Korean evangelist Reverend Sun Myung Moon and the emerging network of organizations involved in the practice of deprogramming. Each group was dedicated to the destruction of the other. Five major methodological problems, common to conducting investigation on single groups, are discussed in the context of researching these two antagonistic groups: 1) role definition and justification; 2) pressures to go native; 3) public pressure to take a stand; 4) evolving commitments; and 5) gaining comparable information and insights. The authors describe their efforts to resolve these problems and maintain a good rapport with both groups. This paper is the product of a joint effort. The order of authorship is random and does not imply any difference in the importance of contributions.     

Optimal estimation of a finite population mean under generalized random permutation models

Employing certain generalized random permutation models and a general class of linear estimators of a finite population mean, it is shown that many of the conventional estimators are “optimal” in the sense of minimum average mean square error. Simple proofs are provided by using a well-known theorem on UMV estimation. The results also cover certain simple response error situations.     

The Characteristics of Two Samples of Women Seeking Abortion in Queensland

The legalization of abortion is still a live issue in Queensland. The numbers and characteristics of women seeking abortion through the Children by Choice Association in 1973–74 and in 1980 were studied since no official statistics on abortion are available. From 1974 to 1980 there was a threefold growth in demand and a threefold rise in the proportion seeking their second or subsequent abortion. Both samples closely reflect the Queensland population as measured by place of birth and religious affiliation. Contraceptive knowledge was found to be associated with education while the proportion who stated they had formal lessons at school rose from 3% to 16% between the samples. In both samples two-thirds of the pregnancies resulted when no physical contraceptive was in use. Social characteristics of the women and men involved were investigated, as well as factors in the abortion decision.     

The Accuracy of Respondent-Coded Occupation

This study reports results from a methodological experimentconducted in a national survey to test the accuracy of respondent-codedoccupation. For most uses, we conclude that such measures aresufficiently precise. There are, however, some systematic sourcesof error which the investigator should be aware of.     

Evaluating the administrative efficiency of courts

In addition to being held accountable for judicial decision, courts, like other public agencies, can and should be evaluated in terms of their administrative efficiency. This paper illustrates how courts can be evaluated in terms of their relative administrative efficiency, using a new approach—data envelopment analysis (DEA)—first proposed by Charnes et al. [1]. The DEA is based upon the economic notion of Pareto optimality which states that a given decision making unit (DMU) is inefficient if some other DMU, or some combination of other DMUs, can produce at least the same amounts of all outputs with less of some resource input and not more of any other resource. Conversely a DMU is said to be efficient if the above is not possible. Charnes et al. [1] generalized the usual input/output ratio measure of efficiency for a given unit in terms of a fractional linear program with fractional constraints. In the case of courts, the efficiency of any particular court is calculated by forming the ratio of a weighted sum of outputs to a weighted sum of inputs, where the weights for both outputs and inputs are to be selected in a manner that calculates the Pareto-Koopmans efficiency of the court. This paper reviews the DEA method and illustrates its application to a data base for 100 criminal superior courts in North Carolina.