‘You Get More Respect,’ Reasons for Sex Among African American High School Youth: A Qualitative Study

ABSTRACT

African American adolescents continue to be disproportionately impacted by HIV, sexually transmitted infections (STIs), and unanticipated pregnancies. In-depth, face-to-face interviews among a convenience sample of 32 African American adolescents (16 male and 16 female) were used to explore the reasons why some adolescents decided to engage in sex while others chose to delay sexual debut. Data were analyzed using a thematic analysis. Among the overall sample, psychological motivations, external pressure, physical pleasure seeking, and relationship-related motivations were the major themes cited for engaging in sex by participants and their friends. External support, motivation to avoid negative consequences, not feeling ready or lacking interest in sex, and having negative views about sex were among the major reasons for delaying sex. Several of the emergent themes showed gender differences. Suggestions for future research include the need for sexual education, and STI/HIV prevention programs that are gender sensitive and flexible enough to accommodate multiple factors related to sexual debut.     

Bootstrap method in ranking and slippage problems

In this paper, the bootstrap method of Efron (1979) is given for a ranking and a slippage problem, where the ranking (or slippage) is with respect to the mean of the distributions. The method is also applied to obtain a confidence interval for the largest mean.     

On selecting the best population

This paper deals with the problem of selecting the “best” population from a given number of populations in a decision theoretic framework. The class of selection rules considered is based on a suitable partition of the sample space. A selection rule is given which is shown to have certain optimum properties among the selection rules in the given class for a mal rules are known.     

Variable Selection via Regression Trees in the Presence of Irrelevant Variables

Many tree algorithms have been developed for regression problems. Although they are regarded as good algorithms, most of them suffer from loss of prediction accuracy when there are many irrelevant variables and the number of predictors exceeds the number of observations. We propose the multistep regression tree with adaptive variable selection to handle this problem. The variable selection step and the fitting step comprise the multistep method.

The multistep generalized unbiased interaction detection and estimation (GUIDE) with adaptive forward selection (fg) algorithm, as a variable selection tool, performs better than some of the well-known variable selection algorithms such as efficacy adaptive regression tube hunting (EARTH), FSR (false selection rate), LSCV (least squares cross-validation), and LASSO (least absolute shrinkage and selection operator) for the regression problem. The results based on simulation study show that fg outperforms other algorithms in terms of selection result and computation time. It generally selects the important variables correctly with relatively few irrelevant variables, which gives good prediction accuracy with less computation time.     

传统性别分工对选用女性干部的影响——基于湖南省某市两次干部考试的思考

当今各级政府干部选用,性别因素在一定程度上起着一定作用,从而导致女性参政处于不利地位。究其原因最为关键的是传统性别分工所带来的影响所致,这种影响主要表现在两个方面：一是它导致了性别刻板角色的形成;二是它强化了带有偏见的社会性别文化。     

Meeting myself: race-gender oppression and a genre study of Black men teachers’ interactions with Black boys

ABSTRACT

Increasing the number of Black men teachers and single-sex schooling options have been heralded as necessary to reverse trends in the failure of US education institutions to adequately educate Black boys. Too little research interrogates Black men teachers’ interactions with Black boys for how they might reinforce anti-oppressive conceptions of race, gender and sexuality. A genre study – the multidimensional, intersectional examination of social identity to explain one’s persistent dehumanization – was utilized to investigate how Black men teachers’ interactions with Black boys shape the boys’ understanding of Black manhood and masculinities. Regardless of schooling arrangement, findings suggest Black men teachers must recognize and disavow hegemonic gender logics in interaction efforts aimed at improving Black boys’ lives. Additionally, I argue the potential of Black men teachers’ interactions with Black boys to function as sites for reimagining Black boys’ humanity in ways that counter persistent messages of their inferiority and disposability (i.e. aniblackness).     

透视跨文化视野下的性别角色社会化

性别别角色贯穿于人的一生,对儿童现在及成年以后的行为方式、兴趣爱好、性格特征和职业偏向等有十分重要的作用。本文在现有研究的基础上,通过分析其影响因素来进一步探讨了文化视野下的性别角色社会化,并就今后的跨文化研究提出了几点思考。     

试论马林诺夫斯基的性人类学研究

性人类学主要针对部落社会以及其他技术不发达的非西方文化中的性实践进行系统的描述和分析 ,关注的主要是生物的、心理的因素和产生性爱冲动、性吸引以及某种特定性行为的文化因素之间的互动关系。马林诺夫斯基是性人类学研究的第一位大师 ,他对异域社会性实践的田野考察建构了一种文化差异 ,为的是让人们找到反省本土文化的机会 ,从而做出建设性的自我批评并抛弃掉那些既武断又矛盾的陈旧观念     

Penalized proportion estimation for non parametric mixture of regressions

Abstract

In this article, we propose a penalized local log-likelihood method to locally select the number of components in non parametric finite mixture of regression models via proportion shrinkage method. Mean functions and variance functions are estimated simultaneously. We show that the number of components can be estimated consistently, and further establish asymptotic normality of functional estimates. We use a modified EM algorithm to estimate the unknown functions. Simulations are conducted to demonstrate the performance of the proposed method. We illustrate our method via an empirical analysis of the housing price index data of United States.     

移动互联网背景下电信运营商产业链延伸合作模式及策略研究

移动互联网的快速发展和市场竞争的加剧促使电信运营商开始转型,加强产业链合作,服务提供商(SP)、内容提供商(CP)等互联网企业和终端制造商是电信运营商寻求合作的重要方向.文章分析了移动互联网背景下电信运营商开展产业链延伸合作的动因;提出了平台开放型、股权投资型、战略联盟型等三种电信运营商和SP/CP的合作模式,以及合约合作型、深入定制型、运营商自建型等三种电信运营商和终端制造商的合作模式;并进一步分析了电信运营商与SP/CP以及终端制造商合作的模式选择策略,以期为中国电信运营商开展产业链合作提供借鉴和参考.