Negotiating who gives birth and the influence of fear of childbirth: Lesbians,bisexual women and transgender people in parenting relationships

BackgroundFear of childbirth (FOC) may affect family planning in lesbian, bisexual and transgender (LBT) couples with two potential carriers of a pregnancy. FOC has previously been researched in heterosexual women, while experiences of LBT people have remained unattended. The choice of birth-giving partner in same-sex couples has gained some attention in previous research, but the potential complexities of the decision have not been studied.AimThe aim is to explore how LBT people negotiate the question of who gives birth, in couples with two potential birth parents, and where one or both partners have a pronounced FOC.MethodsSeventeen self-identified LBT people were interviewed about their expectancies and experiences of pregnancy and childbirth. Data were analysed following a six-step thematic analysis.ResultsFOC was negotiated as one of many aspects that contributed to the decision of who would be the birth-giving partner. Several participants decided to become pregnant despite their fears, due to a desire to be the genetic parent. Others negotiated with their partner about who was least vulnerable, which led some of them to become pregnant despite FOC. Still other participants decided to refrain from pregnancy, due to FOC, and were delighted that their partner would give birth. Several participants described their partner's birth-giving as a traumatic experience for them, sometimes also when the birth did not require any obstetric interventions. The partner's experience was in some cases not addressed in postnatal care.ConclusionsIt is important that healthcare staff address both partners’ prenatal expectancies and postnatal experiences.     

Subset selection of superior populations when the number of populations is large

The situation where k populations are partitioned into one inferior group and one superior group is considered. The statistical problem is to select a random size subset of superior populations while trying to avoid including any inferior populations. A selection procedure is assumed to satisfy the condition that the probability of selecting at least one superior population is bounded below by P¹<1. The performance of a procedure is measured by the probability of including an inferior population.The asymptotic performance, as k→∞ of Gupta's traditional maximum type procedure ψ^G is considered in the location-model. For normally distributed populations, ψ^G turns out to be asymptotically optimal, provided the size of the inferior group does not become infinitely larger than the size of the superior group.     

Some new classes of multivariate survival distribution functions

The concept of the univariate mean remaining life (m.r.l.) function is generalized to the multivariate case. The multivariate mean remaining life (m.m.r.l.) function is utilized to introduce four new classes of multivariate survival distribution functions (s.d.f.'s). Each of these classes is a new generalization of the univariate decreasing mean remaining life (DMRL) class of s.d.f.'s. The duals of these classes are introduced. Some properties, physical interpretation, and relationships among these classes are investigated. Also for each case, the class of s.d.f.'s common in a class and its dual is characterized.     

Back-to-back mixtures of discrete distributions

A method for expanding the choices for fits of discrete data is given. The method is very simple: a breakpoint is chosen for the data set on either side of which two separate discrete distributions are fit. Thus, the method is a mixture of two discrete distributions. The method is appealing in light of the ease with which the likelihood equations simplify. For illustrative purposes, the method is used on the data set that motivated its conception.     

Some determinant optimality aspects of main effect fold-over designs

Saha and Mohanty (1970) presented a main effect fold-over design consisting of 14 treatment combinations of the 24×33 factorial, which had the nice property of being even balanced. Calling this design DSM, this paper establishes the following specific results: (i) DSM is not d-optimal in the subclass Δe of all 14 point even balanced main effect fold-over designs of the 24×33 factorial; (ii) DSM is not d-optimal in the subclass $\text{Δ}{}^1\text{?Δ}{}^{\mathrm{e}}$ of all 14 point even and odd balanced main effect fold-over designs of the 24×33 factorial; (iii) DSM is even optimal in $\text{Δ}{}^1$ and Δe. In addition to these results two 14 point designs in $\text{Δ}{}^1$ are presented which are d-optimal and via a counter example it is shown that these designs are not odd optimal. Finally, several general matrix algebra results are given which should be useful in resolving d-optimality problems of fold-over designs of the kn11×kn22 factorial.     

Some sufficient conditions for the type 1 optimality of block designs

In this paper, we investigate the problem of determining block designs which are optimal under type 1 optimality criteria within various classes of designs having υ treatments arranged in b blocks of size k. The solutions to two optimization problems are given which are related to a general result obtained by Cheng (1978) and which are useful in this investigation. As one application of the solutions obtained, the definition of a regular graph design given in Mitchell and John (1977) is extended to that of a semi-regular graph design and some sufficient conditions are derived for the existence of a semi-regular graph design which is optimal under a given type 1 criterion. A result is also given which shows how the sufficient conditions derived can be used to establish the optimality under a specific type 1 criterion of some particular types of semi- regular graph designs having both equal and unequal numbers of replicates. Finally,some sufficient conditions are obtained for the dual of an A- or D-optimal design to be A- or D-optimal within an appropriate class of dual designs.     

Using Archival Datasets to Study Adoption-Related Questions

ABSTRACT

The Research Digest column describes the contents, availability and methods of accessing large datasets suitable for adoption research. With data collected by or funded by a variety of federal government agencies, the accessibility of these archival datasets enables researchers to pursue some of their investigative interests without all the problems related to data collection. Most of the data are relatively new, having become available to the public only in the 1980s. Secondary analysis of adoption-related material in these datasets could yield valuable insights into important adoption research questions.     

美国次贷危机对我国住房抵押贷款风险防范的启示

2007年,美国次级抵押贷款危机恶化,次贷风波中首当其冲遭遇打击的就是银行业,住房抵押贷款背后隐藏的风险是当前中国商业银行特别应该关注的问题,这场风波为我们敲响了居安思危的警钟。目前中国银行住房信贷也存在着一定风险,美国次贷危机无疑给我国商业银行住房抵押贷款提供了启示和前车之鉴。     

学生观偏差及其对中职教师教育教学的影响与纠正

学生观是教师对学生的看法和态度,它影响着教师教育教学的信心和行为,影响着教师教育教学水平的发挥和教学质量的提高。当前,中职教师普遍认为中职生是＂差生＂,这样的看法是由多种原因造成的。教师的学生观偏差造成教师职业倦怠,信心缺失和教育教学行为偏差。树立正确的中职学生观,消除教师职业倦怠、增强教育教学信心,开展教育教学研究、改革是提高中职教育教学质量的重要途径。