Minimax estimation of a lower-bounded scale parameter of a gamma distribution for scale-invariant squared-error loss

Let X have a gamma distribution with known shape parameter θr;aL and unknown scale parameter θ. Suppose it is known that θ ≥ a for some known a > 0. An admissible minimax estimator for scale-invariant squared-error loss is presented. This estimator is the pointwise limit of a sequence of Bayes estimators. Further, the class of truncated linear estimators C = {θ_ρ|θ_ρ(x) = max(a, ρ), ρ > 0} is studied. It is shown that each θ_ρ is inadmissible and that exactly one of them is minimax. Finally, it is shown that Katz's [Ann. Math. Statist., 32, 136–142 (1961)] estimator of θ is not minimax for our loss function. Some further properties of and comparisons among these estimators are also presented.     

Union Professors: Framing Processes,Mobilizing Structures,and Participation in Faculty Unions*

This study traces the development of union loyalties among community college professors. Assuming that activism is motivated by contextual and ideological factors, the paper analyzes the ways that social networks, collegiate workplaces, and framing practices transform political bystanders into committed union members. Using data from a study of junior college professors in Kentucky (N = 329), the study finds that union participation is strongly linked to a distrust of campus administrators and having pro‐union friends and colleagues. Likewise, perceptions of union efficacy, a liberal identity as well the professor’s education level predicted the actual joining of their campus’ faculty union.     

Landlord Involvement in Environmental Decision-Making on Rented Missouri Cropland: Pesticide Use and Water Quality Issues1

Abstract The need to better understand landlord involvement in decision-making related to pesticide use and water quality issues is evidenced by several trends. These trends include the increasing documentation of water pollution by farm pesticides, the changing characteristics of farm ownership and operator tenure, and evolutions in resource policy and protection planning. This paper utilizes a theoretical approach to the sociology of land tenure to interpret results from an investigation of landlord involvement in environmental decision making regarding pesticide selection on rented land. Eight counties with high susceptibility of water contamination by pesticides were selected for study. Structured, in-person interviews were administered to in-county landlords, and a mail survey was used to poll out-of-county landlords. Results indicate that participation is generally low with very little difference between landlord groups. Renters make most of the organizational and operational decisions on rented farmland. Landlord participation is predominantly based on economic, rather than on social or environmental, factors. Furthermore, while economic variables are important predictors of participation for both groups, gender and social ties to the renter tend to increase local landlord involvement, but not absentee involvement These results have important implications for both federal programs and further research on land tenure and environmental stewardship.     

Estimators of location based on Kolmogorov-Smirnov-type statistics

Two classes of estimators of a location parameter ø₀ are proposed, based on a nonnegative functional H₁^* of the pair (D₁^ø_N, G^ø_N), where and where F_N is the sample distribution function. The estimators of the first class are defined as a value of ø minimizing H₁^*; the estimators of the second class are linearized versions of those of the first. The asymptotic distribution of the estimators is derived, and it is shown that the Kolmogorov-Smirnov statistic, the signed linear rank statistics, and the Cramérvon Mises statistics are special cases of such functionals H₁^*;. These estimators are closely related to the estimators of a shift in the two-sample case, proposed and studied by Boulanger in B2 (pp. 271–284).     

Postcommunist Societies in Times of Transition: Perceptions of Change Among Adolescents in Central and Eastern Europe

This article examines adolescents' perceptions of the economic changes and the justice of the new "social contract" in Eastern/Central Europe. Focusing on three countries, Hungary, Bulgaria, and the Czech Republic, it explores the social, political, and economic environments in which adolescents came of age in 1990. Surveys conducted among high school students in each country during 1995 tapped their perceptions of the economy, the local community, and their personal beliefs about the efficacy of individual initiative and hard work. Responses differed significantly based on age, gender, social class, value orientation, and country. Older adolescents and girls were more likely to observe that economic disparities were growing in their country and to be cynical about the value of hard work. Those with socialist values also discounted the value of recent changes. Adolescents in the Czech Republic were the least cynical about economic changes, whereas those in Bulgaria were the most cynical, with Hungarian youth the least optimistic about the future.     

Youth Political Development: An Introduction

Research on political socialization during the 1950s focused on early precursors of political attitudes and treated children as rather passive participants in the process. A second wave of research in the 1960s considered youth a force creating social change and held that the transition between adolescence and adulthood was a period uniquely suited to examining political issues. Developmental research during the past two decades has emphasized lifelong plasticity and the importance of the sociohistorical contexts in which children grow up. This change in views of development has occurred at a time when populations in all societies are becoming more diverse and when there have been dramatic economic and sociopolitical upheavals throughout the world. Thus there is a renewed importance for research on the political development of young people and the potential for examining this topic in increasingly meaningful ways. This issue highlights a new generation of research in this domain, paying particular attention to international and comparative work and to those studies that bring a fresh and developmental approach.     

Child neglect and adolescent violence: examining the effects of self-control and peer rejection

Child maltreatment researchers have often suggested that experiences with child neglect have long-term, negative effects. Child neglect is thought to have particularly adverse effects on self-control, peer relations, and delinquency. In this research, we examine the relationship of child neglect with adolescent violence via self-control and peer rejection. Using prospective, longitudinal data from a community sample, we find that child neglect adversely affects peer rejection and violence. Neglected children were more likely to be rejected by their peers in early adolescence and were more likely to be violent later in adolescence. Contrary to theoretical predictions, child neglect was not a significant predictor of self-control. Implications for delinquency and child maltreatment researchers are discussed.     

An analysis of the self-control and criminal versatility of gang and dating violence offenders

How versatile are gang and dating violence offenders? Current gang research highlights the versatility of gang members, yet the versatility of intimate violence offenders is often unexamined. Gottfredson and Hirschi, A General Theory of Crime (1990), support the idea of versatile rather than specialized offenders and suggests that low self-control is associated with a host of criminal and noncriminal risk-taking activities. Using data from a self-report sample of 1139 youths in grades 9 through 11, we investigated both the versatility of gang and dating violence offenders and theoretical variables associated with each. We find disproportionate offending by dating and gang violence offenders in a variety of crimes, as well as considerable overlap in the independent variables associated with both types of violence. Low levels of self-control and exposure to general and crime-specific criminal opportunities are significantly associated with engaging in dating and gang violence.