The Johnson System of Frequency Curves—Historical,Graphical, and Limiting Perspectives

Abstract

The idea of transforming one random variate to another with a more convenient density has been developed in the first half of the 20th century. In his thesis, Norman L. Johnson (1917–2004) developed a pioneering system of transformations of the standard normal distribution which gained substantial popularity in the second half of the 20th century and beyond. In Johnson’s 1949 Johnson, N. L. (1949), “Systems of Frequency Curves Generated by Methods of Translation,” Biometrika, 36, 149–176.[Crossref], [PubMed], [Web of Science ®] , [Google Scholar] Biometrika paper entitled Systems of frequency curves generated by methods of translation, summarizing that thesis, one of his primary interests was the behavior of the shape of the probability density functions as their parameter values change. Herein, we attempt to further elucidate this behavior through a series of geometric expositions of that transformation process. In these expositions insight is obtained into the behavior of Johnson’s density functions, and their skewness and kurtosis, as they converge to their limiting distributions, a topic which received little attention.     

Imagined comrades and imaginary protections: identity, community and sexual risk among men who have sex with men in China

This paper describes the recent development of identity and community among gay men in China. It focuses both on the ways emerging forms of gay identity relate to larger ideological and discursive shifts within society, and on the ways these new forms of identity and community affect situated social interaction among gay men themselves. In particular, it addresses the question of how these emerging forms of gay identity and gay community affect the ways gay men in China understand the threat of HIV and make concrete decisions about sexual risk and safety. Among the chief tactics used by gay men in China to forge identity and community involves appropriating and adapting elements from dominant discourses of the Party-State and the mass media. This strategy has opened up spaces within which gay men can claim "cultural citizenship" in a society in which they have been heretofore marginalized. At the same time, this strategy also implicated in the formation of attitudes and social practices that potentially increase the vunerability of Chinese gay men to HIV infection.     

DECENTRALIZATION AND PARTICIPATORY SERVICE DELIVERY

User participation has been promoted to improve the quality, responsiveness, and outreach of public services in India. This qualitative study evaluates new grassroots institutions—Village Education Committees and Mothers’ Committees—in Andhra Pradesh, which promoting parents’ participation in the management and monitoring of local schools and maternal/child health services. Although the committees were found to have increased participation in public affairs by the poor and brought about some improvements in service quality, inclusive and meaningful participation has often been hindered by illiteracy and lack of information, as well as caste, gender, and socioeconomic inequalities. The article suggests that there are considerable tensions between inclusive participation and committee effectiveness as members need skills, status, and resources in order to have a meaningful impact on service provision. In addition, research findings point to the need for more structured opportunities for committee members to interact with authorities and service providers, as well as for children to voice their concerns and ideas. Lastly, in order to tackle childhood poverty more holistically, the focus of these committees should be revised to give greater emphasis to improving service quality improvements and cross-sectoral synergies, rather than the current move narrow focus on infrastructural development and singlesector initiatives.     

Variation in breeding parameters of the Australian magpie Gymnorhina tibicen in suburban and rural environments

The breeding ecology of the Australian magpie Gymnorhina tibicen in suburban and rural areas was compared as part of a study into the synanthropy of the species in southeast Queensland, Australia. During the two years of the study suburban magpies were found to have significantly advanced breeding dates compared to rural magpies. Suburban magpies typically re-nested when an initial nest failed, although this did not result in greater productivity than that of the rural magpies. Suburban magpies had similar mean numbers of young per breeding pair; they also showed higher mortality between fledging and a final count in February. This study suggests that introduced predators and deaths due to motor vehicles may account for this mortality in suburban areas. Anthropogenic factors present within suburban areas such as the watering of lawns and the widespread provision of food for wildlife are likely to play an important role in the differences in the timing of breeding. In addition, temperature may also have an inhibitory effect on the onset of breeding, an influence lessened in the suburban areas due to higher temperatures.     

Relations Between Economic Well-Being,Family Support,Community Attachment,and Life Satisfaction Among LGBQ Adults

While studies with the general population indicate that one’s life satisfaction is related to economic well-being and social support, much less is known about these constructs among lesbian, gay, bisexual, and queer (LGBQ) populations. The current study examines the relationship between economic well-being and life satisfaction in a sample of 458 LGBQ individuals. Further, the direct and moderating effects of family and community support are examined. As hypothesized, perceived financial stress and proximal family support each had a significant main effect on life satisfaction. Household income (adjusted by number of individuals living in the household) had a non-linear effect on life satisfaction. Community support for LGBQ individuals was not associated with life satisfaction, and the moderating hypotheses were not supported. The findings and the implications for future research are discussed.     

Provider and care workforce influences on quality of home-care services in England

A key trend in home care in recent years in England has been movement away from "in-house" service provision by local government authorities (e.g., counties) towards models of service commissioning from independent providers. A national survey in 2003 identified that there were lower levels of satisfaction and perceptions of quality of care among older users of independent providers compared with in-house providers. This paper reports the results of a study that related service users' views of 121 providers with the characteristics of these providers. For the most part, characteristics associated with positive perceptions of quality were more prevalent among in-house providers. Multivariate analyses of independent providers suggested that aspects of the workforce itself, in terms of age and experience, provider perceptions of staff turnover, and allowance of travel time, were the most critical influences on service user experiences of service quality.     

The first three years after foster care: A longitudinal look at the adaptation of 16 youth to emerging adulthood

Sixteen former foster youth were followed for 3 years to examine their adaptation to emerging adulthood. Youth were classified on their adaptation according to 2 concepts, Connectedness and Risks. Connectedness refers to engagement with the adult world through work, schooling, marriage, and parenthood. Risks refer to problems with substance abuse, financial difficulties, and mental health problems that would hinder engagement with the adult world. All of the youth maintained at least one adult connection, but only 6 youth did not have a risk at the final interview. Three years after discharge 50% of the respondents had a drug and/or alcohol problem, and had neither savings nor health insurance. Despite many problems the post foster care period was marked by much resilience as most struggled to remain independent, and continue their schooling. Factors which facilitated successful adaptations were: a period of transitional residence after foster care, good support systems including family and former social workers, and a commitment to further education.