Hypothesis Testing of CNA Perceptions of Organizational Culture in Long Term Care

This commentary for the special issue on research that went wrong describes a study that explored factors that contribute to variability within Certified Nursing Assistants (CNAs) on organizational safety culture. We know from previous research that CNAs provide most direct care in nursing homes and that direct care workers often experience agency culture differently from agency management (Wolf et al., 2014). We were looking for factors that nursing homes could alter to improve the culture for CNAs, and thus, residents. We conducted a secondary analysis of data collected via a multi-component paper survey of CNAs employed in long term care. We used results from the Nursing Home Survey on Patient Safety Culture and primary shift, type of unit, and years as a CNA to identify modifiable characteristics that would explain variability in the perceptions of patient safety culture. The final sample included n = 106 from three nursing homes. Dimension scores were compared using bivariate tests appropriate to the scale and ordinal logistic regression. Despite support in the literature for the hypothesis, we found few significant differences on the total scale within groups. Differences in perceptions have implications for quality of care and the experiences of residents within nursing homes.     

A unified approach to stochastic comparisons of multivariate mixture models

In this paper, we consider a unified approach to stochastic comparisons of random vectors corresponding to two general multivariate mixture models. These stochastic comparisons are made with respect to multivariate hazard rate, reversed hazard rate and likelihood ratio orders. As an application, results are presented for stochastic comparisons of generalized multivariate frailty models.     

FPT algorithms for Connected Feedback Vertex Set

We study the recently introduced Connected Feedback Vertex Set (CFVS) problem from the view-point of parameterized algorithms. CFVS is the connected variant of the classical Feedback Vertex Set problem and is defined as follows: given a graph G=(V,E) and an integer k, decide whether there exists F?V, |F|??k, such that G[V?F] is a forest and G[F] is connected. We show that Connected Feedback Vertex Set can be solved in time O(2 ^O(k) n ^O(1)) on general graphs and in time $O(2^{O(\sqrt{k}\log k)}n^{O(1)})$ on graphs excluding a fixed graph H as a minor. Our result on general undirected graphs uses, as a subroutine, a parameterized algorithm for Group Steiner Tree, a well studied variant of Steiner Tree. We find the algorithm for Group Steiner Tree of independent interest and believe that it could be useful for obtaining parameterized algorithms for other connectivity problems.     

Neo-natal mortality in South Asia: The special role of tetanus

Summary First-year mortality in rural Uttar Pradesh is characterized by a predominance (60 per cent) of deaths during the first month of life, of which 66 per cent are reported to be due to tetanus. This pattern is not typical of the historical experience of many developed countries and the current experience of some less developed countries where post-neo-natal mortality predominates. To examine this phenomenon, two causal models of neo-natal mortality (one for tetanus and one for all other diseases) are developed and tested using retrospective survey data from 2000 couples living in rural Uttar Pradesh. Neo-natal tetanus mortality is found to be primarily a function of opportunities for exposure to the disease (e.g. lack of antiseptic birth practices, ownership of large animals) rather than of socio-economic status or demographic variables. The importance of examining neo-natal mortality by cause, and the shortcomings inherent in making inferences from the historical experiences of Western nations are emphasized.     

Neo-natal mortality in South Asia: The special role of tetanus

First-year mortality in rural Uttar Pradesh is characterized by a predominance (60 per cent) of deaths during the first month of life, of which 66 per cent are reported to be due to tetanus. This pattern is not typical of the historical experience of many developed countries and the current experience of some less developed countries where post-neo-natal mortality predominates. To examine this phenomenon, two causal models of neo-natal mortality (one for tetanus and one for all other diseases) are developed and tested using retrospective survey data from 2000 couples living in rural Uttar Pradesh.

Neo-natal tetanus mortality is found to be primarily a function of opportunities for exposure to the disease (e.g. lack of antiseptic birth practices, ownership of large animals) rather than of socio-economic status or demographic variables. The importance of examining neo-natal mortality by cause, and the shortcomings inherent in making inferences from the historical experiences of Western nations are emphasized.     

Simultaneous selection of extreme populations:a bayesian approach

The problem of simultaneously selecting two non-empty subsets, S_Land S_U, of k populations which contain the lower extreme population (LEP) and the upper extreme population (UEP), respectively, is considered. Unknown parameters θ₁,…,θ_kcharacterize the populations π₁,…,π_kand the populations associated with θ_[1]=min θ_i. and θ_[k]= max θ_i. are called the LEP and the UEP, respectively. It is assumed that the underlying distributions possess the monotone likelihood ratio property and that the prior distribution of θ= (θ₁,…,θ_k) is exchangeable. The Bayes rule with respect to a general loss function is obtained. Bayes rule with respect to a semi-additive and non-negative loss function is also determined and it is shown that it is minimax and admissible. When the selected subsets are required to be disjoint, it shown that the Bayes rule with respect to a specific loss function can be obtained by comparing certain computable integrals, Application to normal distributions with unknown means θ₁,…,θ_kand a common known variance is also considered.     

Client Experiences of Trauma-Informed Care in Social Service Agencies

This paper describes a qualitative study of individual client interviews (n?=?26) from four social service agencies to understand how clients experience trauma-informed care services and implementation challenges. We used the Fallot and Harris framework to explore client experiences of the five core concepts of trauma-informed care (safety, trustworthiness, choice, collaboration, and empowerment) using semi-structured interview questions with each client. The four agencies consisted of: refugees (n?=?4), substance abuse (n?=?8), older adults (n?=?12), and maternal/child health (n?=?2), and the agencies varied in size, service goals, and clientele. The results of the study suggest that clients’ experience of these concepts was shaped by the actions of other clients, and these experiences were either mitigated or hindered by actions of the agency employees. Agency policies either supported or enhanced their experiences as well. The results also suggest that it was challenging for agencies to provide for all of the trauma-informed care (TIC) concepts at the same time. We discuss the implications of these findings for social service delivery in a range of agency types. Future research should examine the effects of trauma-informed policies on client experiences of each TIC domain.     

Dynamics of buried seed population and seedling cohorts of two dominant weeds in a hill agroecosystem of the humid subtropics of India

Dynamics of the buried seeds and plant population of two dominant weeds, viz.,Emilia sonchifolia (Linn.) DC. andRichardsonia pilosa HBK were studied in the crop fields of Meghalaya, north-east India during radish and maize cropping and intervening fallow periods. The total buried seed population ofR. pilosa was always larger than that ofE. sonchifolia, but the germinable fraction was invariably greater in the latter. A major portion (39–41%) of the viable (germinable+dormant) seed population in both weeds was confined to the surface soil layer (0–5 cm). The viable seed population ofE. sonchifolia peaked during April, while that ofR. pilosa showed two peaks (during August and December). The survival pattern and half-lives of seedling cohorts showed, some differences in the two weed species, but both being summer annuals, their populations behaved in a similar manner by showing higher seedling recruitment (K) and survivorship (p) rates in the summer crop (maize) than in the winter crop (radish). However, the density of plants that could attain adulthood was significantly higher inE. sonchifolia thanR. pilosa which might have resulted in greater seed input of the former to the soil leading to its greater abundance in the crop fields. Supported by the University Grants Commission, New Delhi (Grants No. F. 3-37/87 SR II)     

基尼系数是一个完备的不平等程度的度量指标吗？

一、简介用来测度收入不平等程度的广为人知的基尼系数有时也会受到挑战。虽然其正确性毋庸置疑,但是在对基尼系数进行分解研究的时候,其无法被证明是一个完美的测度指标。这可以被认为是由于收入分组的复杂本质。更加具体的说,当存在“重叠”现象时,基尼系数就缺乏一定的“纯度”。当表征收入不平等程度的基尼系数被分解成组间和组内贡献的时候,如果子小组的收入界定范围产生了重叠,那么一个麻烦的、很难理解的残差项就会产生。此时使用基尼系数就会出现不明确的结果。与不同收入区间对应的收入分组内的个人会被重复计算,而这种重复计算就…