Considerations for Effective Simulation Study Analysis

This article discusses estimation of several percentiles simultaneously, develops a simple test to compare the sizes of two test statistics, and considers the use of logit models to adjust power curves to have the same null hypothesis level.     

Authentication Methods and Recent Developments

Abstract

This segment of the “Sharpest Tool” column provides an overview of the current options for authentication for electronic resources and discusses recent developments in this area. Remote access to electronic resources is increasingly important as libraries purchase more and more electronic content. This column attempts to provide a baseline use for many terms relating to authentication, while incorporating discussions and concerns surrounding recent developments in authentication methods.     

What are the facilitators,inhibitors, and implications of birth positioning? A review of the literature

BackgroundFrom the historical literature it is apparent that birthing in an upright position was once common practice while today it appears that the majority of women within Western cultures give birth in a semi-recumbent position.AimTo undertake a review of the literature reporting the impact of birth positions on maternal and perinatal wellbeing, and the factors that facilitate or inhibit women adopting various birth positions throughout the first and second stages of labour.MethodsA search strategy was designed to identify the relevant literature, and the following databases were searched: CINAHL, CIAP, the Cochrane Database of Systematic Reviews, Medline, Biomed Central, OVID and Google Scholar. The search was limited to the last 15 years as current literature was sought. Over 40 papers were identified as relevant and included in this literature review.ResultsThe literature reports both the physical and psychological benefits for women when they are able to adopt physiological positions in labour, and birth in an upright position of their choice. Women who utilise upright positions during labour, have a shorter duration of the first and second stage of labour, experience less intervention, and report less severe pain and increased satisfaction with their childbirth experience than women in a semi recumbent or supine/lithotomy position. Increased blood loss during third stage is the only disadvantage identified but this may be due to increased perineal oedema associated with upright positions. There is a lack of research into factors and/or practices within the current health system that facilitate or inhibit women to adopt various positions during labour and birth. Upright birth positioning appears to occur more often within certain models of care, and birth settings, compared to others. The preferences for positions, and the philosophies of health professionals, are also reported to impact upon the position that women adopt during birth.ConclusionUnderstanding the facilitators and inhibitors of physiological birth positioning, the impact of birth settings and how midwives and women perceive physiological birth positions, and how beliefs are translated into practice needs to be researched.     

The Systems Psychodynamics of a Joint Venture: Anxiety, Social Defenses, and the Management of Mutual Dependence

Joint ventures, mergers and other forms oforganizational alliances are rapidly becoming a businessnecessity. However, on an almost daily basis, experiencesuggests that such alliances often pose critical dilemmas for those entering into them. Centralamong these are collaborating across differences inorganizational cultures and forging a new organizationalidentity. At a deeper level, there are also often paranoid concerns and fantasies about thelong-term lack of equity in the transfer of knowledgeand capability. This paper, therefore, outlines asystems psychodynamic perspective on intergroup andinterorganizational relationships for developing an in-depthunderstanding of some common irrational and emotionaldifficulties alliance relationships face. It then goeson to describe an illustrative case and concludes with an appraisal of the advantages of a systemspsychodynamic conceptual perspective — taking bothstructure and process into account — which hasbeen neglected or minimized in the literature onorganizational alliances.     

Neural mechanisms of language development in infancy

Understanding the neural processes underpinning individual differences in early language development is of increasing interest, as it is known to vary in typical development and to be quite heterogeneous in neurodevelopmental conditions. However, few studies to date have tested whether early brain measures are indicative of the developmental trajectory of language, as opposed to language outcomes at specific ages. We combined recordings from two longitudinal studies, including typically developing infants without a family history of autism, and infants with increased likelihood of developing autism (infant-siblings) (N = 191). Electroencephalograms (EEG) were recorded at 6 months, and behavioral assessments at 6, 12, 18, 24 and 36 months of age. Using a growth curve model, we tested whether absolute EEG spectral power at 6 months was associated with concurrent language abilities, and developmental change in language between 6 and 36 months. We found evidence of an association between 6-month alpha-band power and concurrent, but not developmental change in, expressive language ability in both infant-siblings and control infants. The observed association between 6-month alpha-band power and 6-month expressive language was not moderated by group status, suggesting some continuity in neural mechanisms.     

Everyday discrimination,emotion, and daily interactions during adolescence

The present study examined whether everyday discrimination relates to the frequency of adolescents' positive and negative daily social interactions and whether these associations are driven by anger and positive emotion. Adolescents (N = 334) participated in a three-wave longitudinal study, in which they completed surveys regarding everyday discrimination, anger, and positive emotion, as well as 15 daily reports of conflict and getting along with friends and family. Higher everyday discrimination was related to more daily conflicts and fewer experiences of getting along with other people. Longitudinal models also provided preliminary evidence that everyday discrimination was associated with daily conflicts 4 years later indirectly through anger. Overall, results suggest everyday discrimination relates to adolescents' daily experiences, potentially through differences in emotion.     

Lesbian landscape

ABSTRACT

In this article about first love, the author discusses her coming of age as a lesbian who is also tribally affiliated.     

Editorial: Crossed Up at the Border

Population and Environment -     

Teachers’ unions and excellence in education: Comment

In a recent article in this journal, Michael Kurth presented what he considered evidence that teachers’ unions impair educational achievement and that what they must do to increase teachers’ salaries is harmful to educational excellence. This comment critically examines Kurth’s misspecified model and the misleadingly defined variables that led to the erroneous empirical support for his conclusion. Our own estimates indicate that states with a high level of collective bargaining had higher SAT scores in 1982.