Estimating a frequency distribution when the sampling is biased

A simple random sample on a random variable A allows its density to be consistently estimated, by a histogram or preferably a kernel density estimate. When the sampling is biased towards certain x-values these methods instead estimate a weighted version of the density function. This article proposes a method for estimating both the density and the sampling bias simultaneously. The technique requires two independent samples and utilises ideas from mark-recapture experiments. An estimator of the size of the sampled population also follows simply from this density estimate.     

Queering Data Collection: Using the Life History Calendar Method With Sexual-Minority Youth

ABSTRACT

A challenge for research with sexual-minority youth is to capture their unique stories in a way that heightens understanding of lived experience and promotes the development of culturally relevant programs and policies tailored for this population. One data collection approach that may be particularly useful for research with sexual-minority youth is the life history calendar (LHC) method. The LHC provides a visual, calendar-based assessment of life events and behaviors anchored by contextual cues to enhance retrospective recall. The purpose of this article is to examine the utility of the LHC method with sexual-minority youth and its potential to address three methodological and conceptual challenges: developmental complexity, shifting and evolving identities, and timing. The LHC method is illustrated using three studies conducted by the author as case examples. Findings suggest that the LHC offers several potential benefits for research with sexual-minority youth including its adaptable and flexible structure, capacity to assess event timing and sequence, mixed-methods capability, and its ability to engage and empower youth to co-create the interview process. Strengths and limitations of the LHC method and implications for research and practice with sexual-minority youth in a range of social service settings are discussed.     

温哥华公交线网和运营规划模型及启示

温哥华作为公交系统非常完善和发达的城市,由TransLink负责地区公交规划运营、管理和融资,以及区域公交模型(RTM)的开发和应用.从模型产生的背景、模型构架和要素以及模型的标定进行阐述,并举例说明模型在温哥华城市公交规划项目中的具体应用,旨在为中国公共交通线网和运营模型的建立提供可借鉴的经验.     

'In the real world we're all put on the spot at some time or other,so you need to be prepared for it': An exploratory study of an oral method of assessing knowledge of mental health law

The education and training of Approved Social Workers (ASWs) involves at least 60 days of college and practice-based learning. A major component of the college-based curriculum is the teaching and assessment of knowledge of mental health law. One programme in England assesses student knowledge of law by an oral examination that includes a case discussion and questions about the Mental Health Act 1983. Oral assessment of knowledge of law is commonplace for those entering legal professions. Oral assessment of clinical knowledge in professions such as medicine and psychiatry is similarly frequent. However, examination by oral assessment is not usual in social work education. An exploratory study by postal questionnaire of all past students of the programme and their line managers was undertaken to establish their views of this means of assessing knowledge of law. This paper considers the results of the research and outlines student perceptions of the law oral assessment as preparation for practice as an ASW. The paper focuses on three distinct but interlinked areas--education, assessment and practice--and suggests some implications for educators and practitioners, which are especially relevant in the light of the current review of mental health legislation.     

The Relationship Between Sexual Minority Verbal Harassment and Utilization of Health Services: Results from Countywide Risk Assessment Survey (CRAS) 2004

In this article we examine the prevalence of and associations between sexual orientation–based verbal harassment and reported utilization of health services across levels of sexual orientation in a diverse sample of adult recipients of Los Angeles County–funded HIV-related health and social services. Thirty-two percent reported they had experienced verbal harassment, the majority (80.3%) of whom identified as lesbian, gay, or bisexual (LGB). Those who reported being verbally harassed received significantly more services overall than those who were not verbally harassed, and service utilization varied by sexual orientation. These findings inform future efforts to identify and assess social discrimination in health and social service settings.     

A Phenomenological Study of Postdivorce Adjustment in Midlife

Today, 50% of all U.S. marriages are expected to end in divorce, with the majority of the divorces being granted to individuals between the ages of 45 and 54. Gaining an understanding of the lived experience of postdivorce adjustment as seen in midlife was the aim of this study. A phenomenological research design was used. The themes that emerged from the data included time, emotional pain, changes in postdivorce parenting, and a sense of starting over. The clinical implications of this study suggest that obtaining an understanding of the postdivorce adjustment experience might help mental health practitioners enhance care for divorced individuals, divorcing couples, and their family members.     

Developing the DSM-IV-DSM-IV Criteria to Identify Adolescent Problem Gambling in Non-Clinical Populations

This paper presents a revised version of DSM-IV-J criteria for youth, the DSM-IV-MR-J, together with psychometric data stemming from its use in a major prevalence study of adolescent gambling and problem gambling. The case is made for further development and testing of current and emerging instruments to screen for problem gambling in youth, with the aim of establishing one internationally accepted gold standard measure.     

Measuring the Prevalence of Sector-Specific Problem Gambling: A Study of Casino Patrons

This study is the first attempt to measure the prevalence of problem gambling attributable to a specific sector of the gambling industry. One thousand, one hundred and five casino patrons in 40 casinos in the UK were interviewed, face-to-face. Respondents were screened for problem gambling using a multiple response version of DSM-IV (DSM-IV-MR). The study found support for Eadington's (1988) hypothesis, that UK casinos could be largely sustained by regular players, among whom the prevalence of problem gambling is high. The study also found support for the hypothesis that, to the extent different gambling sectors are patronised by demographically different client groups, so the problem gamblers associated with them will reflect these client groups. The problem gamblers among the regular casino patrons were demographically distinct from the problem gamblers in the sample who showed a preference for other gambling forms. Other key findings support those found in other jurisdictions. Sector-specific prevalence studies may be the next step forward in epidemiological research on problem gambling. They have the major advantage of netting significantly more problem gamblers from much smaller samples than similar studies in the general population. They also have the potential to reveal the proportion of problem gamblers attributable to each sector, along with their demographic characteristics. Such information would result in more specific information being available for regulators seeking to minimise the social impact of problem gambling and those involved in the development of prevention and treatment strategies.