Two permutation tests of equality of variances

The F-ratio test for equality of dispersion in two samples is by no means robust, while non-parametric tests either assume a common median, or are not very powerful. Two new permutation tests are presented, which do not suffer from either of these problems. Algorithms for Monte Carlo calculation of P values and confidence intervals are given, and the performance of the tests are studied and compared using Monte Carlo simulations for a range of distributional types. The methods used to speed up Monte Carlo calculations, e.g. stratification, are of wider applicability.     

Living with the stigma of AIDS

This article uses interview data to explore how 23 gay and bisexual men who had AIDS were affected by and managed stigma. The article describes how stigma affects the relationships of persons with AIDS to their families, friends, lovers, colleagues, and health care providers. It explores how persons with AIDS avoid or reduce stigma by concealing their illnesses, learning when and to whom they should reveal their illnesses, changing their social networks, educating others about AIDS, developing nonstigmatizing theories of illness causation, and using bravado to convince others that they are still functioning social beings.     

Unemployment classifications and subjective well-being

Further research on the impact of unemployment on workers and their families requires greater refinement and more precise measurement of the concept. While previous studies have indicated the effects of unemployment on a wide range of variables, such as health and well-being, many of these studies suffer from imprecision by conceptualizing unemployment too narrowly and by using too strict a dichotomy between currently employed and currently unemployed workers. This research effort attempts to broaden and refine the concept of unemployment by defining it in terms of two job dimensions: current employment status and previous job loss. Using this conceptualization, the authors find that current unemployment after other job losses may have more devastating effects on well-being than losing one's job for the first time. Similarly, among the currently employed, those who have lost jobs in the past may experience more emotional difficulties than those who have never lost their jobs.     

大家都是过来人

最近跟朋友聊天,大家最关心的话题就是找工作了,因为都是初入职场,所以大家都渴望互相多交流一些情况。一般问起“工作、薪水”来,大家都挺愿意说的,不过至于说的内容里有没有水分我无法判断。我个人也只是问问,心里有个底,别人工作的好坏、薪水高低我是不会作评价的。因为我不看重这个,我想要的是经验,钱少点、工作累点都没     

A Modified Knox Test of Space-Time Clustering

Tests of space-time clustering such as the Knox test are used by epidemiologists in the preliminary analysis of datasets where an infectious aetiology is suspected. The Knox test statistic is the number of cases close in both space and time to another case. The test statistic proposed here is the excess number of such cases over that expected under H₀ of no infection. It is argued that this modified test is more powerful than the Knox test, because the test statistic is not heavily tied as is the Knox test statistic. The use of the test is illustrated with examples.     

Correlates of African American female adolescent offenders 3, 4-Methylenedioxymethamphetamine (MDMA or “Ecstasy”) use and sexually transmitted infection morbidity

Abstract

The current study was designed to determine the extent to which self-reported ecstasy use in a population of juvenile adolescent detainees in a southern state is associated with high-risk health behaviors pertaining to sexually transmitted infection (STI) symptomology and past history of STI occurrence. Participants were 764 African American females extracted from an overall sample of 2,260 juvenile offenders housed at selected Youth Development Campuses in the state of Georgia. Significance tests were conducted using univariate logistic regressions to examine the independent associations of participant’s self-reported ecstasy use and dichotomized HIV risk behavior correlates and history of having a prior STI before the most recent incarceration Participants who reported ecstasy use prior to incarceration were 1.7 (OR = 1.68, 95% CI = 0.78–3.64) and 1.8 times (OR = 1.87, 95% CI = 1.24–2.81) more likely respectively to indicate having had genital warts or chlamydia, and were more than 1.5 times (OR = 2.21, 95% CI = 0.83–5.44) and two times more likely to report having had gonorrhea or herpes, accordingly. Prevention programs for adolescent offender populations should develop interventions that target adolescents’ substance use behavior as a function of STI risk taking as well as being culturally competent to deal specifically with these problem behaviors.     

Evaluations and Future Plans After Casual Sexual Experiences: Differences Across Partner Type

Casual sexual relationships and experiences (CSREs) are common among emerging adults, and their diversity may contribute to variability in their associations with mental health and future romantic relationship development. The present research used multiple regression analyses to examine how CSRE type (casual dating, friends with benefits [FWB], or booty call/one-night stand) is associated with short-term outcomes of these experiences, including positive and negative evaluations, plans to start a romantic relationship with a CSRE partner, and general plans for future CSREs. College students and non-college-attending emerging adults (N = 192, 80% female, mean age = 22.09 years) reported on recent sexual encounters through daily diaries collected around an alcohol consumption holiday. Individuals with casual dating partners evaluated their experiences more positively and/or less negatively than individuals with booty calls/one-night stands; these associations were moderated by gender and sexual behavior type. Individuals with casual dating partners were more oriented toward pursuing a romantic relationship with their partners than individuals with FWB or booty calls/one-night stands. However, no association was found between CSRE type and plans for future CSREs in general. Results highlight the diversity of CSREs and suggest that casual dating may be more rewarding than FWB and booty calls/one-night stands, particularly for women.