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151.
Correlation-Type Goodness of Fit Test for Extreme Value Distribution Based on Simultaneous Closeness
In reliability studies, one typically would assume a lifetime distribution for the units under study and then carry out the required analysis. One popular choice for the lifetime distribution is the family of two-parameter Weibull distributions (with scale and shape parameters) which, through a logarithmic transformation, can be transformed to the family of two-parameter extreme value distributions (with location and scale parameters). In carrying out a parametric analysis of this type, it is highly desirable to be able to test the validity of such a model assumption. A basic tool that is useful for this purpose is a quantile–quantile (QQ) plot, but in its use, the issue of the choice of plotting position arises. Here, by adopting the optimal plotting points based on Pitman closeness criterion proposed recently by Balakrishnan et al. (2010b), and referred to as simultaneous closeness probability (SCP) plotting points, we propose a correlation-type goodness of fit test for the extreme value distribution. We compute the SCP plotting points for various sample sizes and use them to determine the mean, standard deviation and critical values for the proposed correlation-type test statistic. Using these critical values, we carry out a power study, similar to the one carried out by Kinnison (1989), through which we demonstrate that the use of SCP plotting points results in better power than with the use of mean ranks as plotting points and nearly the same power as with the use of median ranks. We then demonstrate the use of the SCP plotting points and the associated correlation-type test for Weibull analysis with an illustrative example. Finally, for the sake of comparison, we also adapt two statistics proposed by Gan and Koehler (1990), in the context of probability–probability (PP) plots, based on SCP plotting points and compare their performance to those based on mean ranks. The empirical study also reveals that the tests from the QQ plot have better power than those from the PP plot. 相似文献
152.
Christine L. Ferguson 《Serials Review》2013,39(1-2):48-53
abstractAn array of browser extensions has been developed to help researchers locate full-text content, whether that full text is available in an institutional repository, on a publishers site, or in an open access journal. Examples of such browser extensions include Unpaywall, Kopernio, EZproxy tools, and Lean Library. This Balance Point column focuses on the growth of browser extensions, the need they are filling, and their adoption by libraries. Particular attention is paid to the Lean Library browser extension and the services offered by Lean Library. Drawing on the literature and interviews with librarians in the field, the advantages and disadvantages of browser extensions are addressed, as well as security concerns. 相似文献
153.
ABSTRACT The shift in the technology landscape has altered the technology ecosystem of adolescents and emerging adults in the 21st century. Yet, with greater use of digital gadgets comes greater mental health risks that technological advancement brings. This study provides a narrative review of contemporary cyber risks faced by adolescents and emerging adults. In particular, this review will cover dangers and effects of cyber-bullying, social media, cyber-dating violence, sextortion, sexting, revenge porn, online dating, catfishing, and scammers, with an emphasis to raise awareness and encourage proactive efforts dedicated to address these social concerns as the digital era continues to evolve. 相似文献
154.
Rima Kaddoura Jocelyn DeJong Huda Zurayk Tamar Kabakian Christine Abbyad Fadi G. Mirza 《Women and birth : journal of the Australian College of Midwives》2019,32(2):e223-e228
Problem
There is lack of data on the rate of episiotomy in Lebanon and the study’s hospital.Background
Only a few studies have addressed episiotomy practice in Lebanon and the Middle East and they show varying rates.Aim
To identify the rate, and change in rate, of episiotomy practice over the years at a teaching hospital in Lebanon and to assess whether maternal age, parity, fetal weight, woman’s hospital admission class, and physician’s gender were associated with episiotomy. We also tested the association between episiotomy and postpartum hemorrhage and/or high degree perineal tears.Methods
A retrospective observational study was conducted on 1756 records for women having a normal vaginal birth at a single centre from January 2009 to January 2014.Findings
The rate of episiotomy at the hospital was very high, with 97.4% of women receiving an episiotomy in 2009. A major decrease in the rate was identified with a decline from 97.4% in 2009 to 73.3% in January 2014. Episiotomy was found to be associated with parity, maternal age, and with high degree perineal tears.Discussion
The episiotomy rate at this centre remains higher than the 10% rate recommended by the World Health Organization, although there has been a significant reduction after a call for restrictive rather than liberal use.Conclusion
Raising awareness among providers appeared to play a significant role in reducing this rate, although more efforts remain warranted. Other strategies – such as raising awareness of women about potential risks of episiotomy – are also worth exploring. 相似文献155.
Jost Wilker Karsten Rusche Christine Rymsa-Fitschen 《Planning Practice and Research》2016,31(3):229-249
Green infrastructure is a strategic planning concept that is able to address environmental, social and even economic problems by supplying a variety of benefits for society. Especially in times of public financial crises and spatial transformation, it is important to ensure that those services are high quality to guarantee that they will provide the intended benefits by integrating stakeholders’ knowledge and experience into green infrastructure planning. Active stakeholder participation leads to legitimate and informed future planning that accounts for society’s needs. This paper investigates participation approaches of six green infrastructure investments in Belgium, the UK, Germany and the Netherlands. The major aim is to explore how and when participation should take place to optimize participation in green infrastructure planning. This is achieved by surveying the stakeholders involved and conducting stakeholder discussions to identify their views on the participation approaches employed and their integration into the planning process. We found that stakeholders were generally satisfied with how they were involved but desired a broader and more tailored mix of approaches. Furthermore, we found several Arnstein gaps, which lead us to conclude by suggesting recommendations that are helpful for successful participation in green infrastructure planning. 相似文献
156.
We examine the treatment of female characters in videocassette pornography. Using a systematic sample, we analyze 209 vignettes
in 40 x- to xxx- rated videos commercially available from a national chain in the local market. We found that most videos
had sexually violent or dehumanizing/degrading themes; however, a significant number also had a theme of intimacy. As expected,
we found little evidence (one case) of extreme sexual deviance. Extreme sexual deviance was the kind of sexual violence the
1986 Commission on Pornography assumed was commonly available in pornography today. We also examined how the race of the actor
shapes pornographic violence. As hypothesized, we found that black women experienced more violence from both white and black
men than was the case for white women. White women, in fact, experienced least violence when paired with a black man. Our
work replicates that of others in that we found few intimacy themes in material where black actors were present. 相似文献
157.
158.
A weighted approximation to a sequence of continuous time martingales by a time transformed Wiener process is established. The basic tool of proof is the Skorohod imbedding for martingale difference sequences. As an application of the main result a useful weighted approximation to the randomly weighted uniform empirical process is derived. A number of other applications are also discussed. 相似文献
159.
Catling-Paull C Dahlen H Homer CS Homer CC 《Women and birth : journal of the Australian College of Midwives》2011,24(3):122-128
Background
Hospital birth is commonly thought to be a safer option than homebirth, despite many studies showing similar rates of safety for low risk mothers and babies when cared for by qualified midwives with systems of back-up in place. Recently in Australia, demand has led to the introduction of a small number of publicly-funded homebirth programs. Women's confidence in having a homebirth through a publicly-funded homebirth program in Australia has not yet been explored.Aim
The aim of the study was to explore the reasons why multiparous women feel confident to have a homebirth within a publicly-funded model of care in Australia.Methods
Ten multiparous English-speaking women who chose to have a homebirth with the St George Hospital Homebirth Program were interviewed in the postnatal period using semi-structured, open-ended questions. Interviews were transcribed, then a thematic analysis was undertaken.Results
Women, having already experienced a normal birth, demonstrated a strong confidence in their ability to give birth at home and described a confidence in their bodies, their midwives, and the health system. Women weighed up the risks of homebirth through information they gathered and integration with their previous experience of birth, their family support and self-confidence.Discussion
Women choosing publicly-funded homebirth display strong confidence in both themselves to give birth at home, and their belief in the health system's ability to cope with any complications that may arise.Implications for practice
Many women may benefit from access to publicly-funded homebirth models of care. This should be further investigated. 相似文献160.
This analysis contributes to LGBT campus climate research on the quality of campus life in higher education in the United States. We argue that public education institutions in different states face divergent impediments to improving campus climate, and that more research is needed identifying structural factors affecting campus climate. Using a social systems analysis of policymaking at one university as a case study, we illustrate how partisan politics and state regulation make Virginia colleges and universities more vulnerable to political scrutiny and control. Finally, we propose a social justice-oriented policy agenda to address structural inequalities. 相似文献