Combining an Internal Pilot with an Interim Analysis for Single Degree of Freedom Tests

An internal pilot with interim analysis (IPIA) design combines interim power analysis (an internal pilot) with interim data analysis (two-stage group sequential). We provide IPIA methods for single df hypotheses within the Gaussian general linear model, including one and two group t tests. The design allows early stopping for efficacy and futility while also re-estimating sample size based on an interim variance estimate. Study planning in small samples requires the exact and computable forms reported here. The formulation gives fast and accurate calculations of power, Type I error rate, and expected sample size.     

The poisson-inverse gaussian disiribuiion as a model for species abundance

An inverse Gaussian mixture of Poisson distributions(the P-IG distribution) is considered as a model for species abundance data,, Minimum chi-square and maximum likelihood methods of estimation for the zero-truncated P-IG distribution are developed, Ihe performance of the P-IG distribution is illustrated and discussed for several well-known sets of insect abundance data.     

Power‐base Research in Marketing Channels: A Narrative Review

This paper provides a contemporary and comprehensive review of work in the marketing channel field that is based on French and Raven's power‐base theory. It traces the development of theoretic, conceptual and methodological orthodoxies from the 1970s. Mirroring the movement towards the relationship marketing paradigm, the paper considers the theory's empirical contribution to knowledge of power, conflict, trust and commitment in marketing channels. Limitations relating to inconsistency of treatment, contradictory findings and the simplification of complex phenomena are identified. Nevertheless, current work extends power‐base theory to other cultures, other styles of research and to the area of supply chains. The review raises questions about the value of contribution made using this theory and notes the surprising absence within the channels literature of the broader, current debate about power. To illustrate, the paper shows how Clegg's (1989. Frameworks of Power. London: Sage) circuits of power framework, if applied to channel contexts, could address forms of power that are invisible, anonymous and not necessarily negative. Applications and methods are discussed, opening a space wherein a broadened understanding of power is integrated within a focus upon cooperative channels.     

Doing Disability: Disability Formations in the Search for Work*

Disability theorists have spent much time discussing how disability is defined. The theoretical roots for these debates reside in the medical, structural, and minority models of disability. The medical model views disability as equivalent to a functional impairment; the minority model sees a lack of equal rights as a primary impediment to social equality between able and disabled populations; and the structural model looks to environmental factors as the cause of disability. While debates over how to define disability are informative, there is currently an insufficient amount of empirical research looking at how people come to identify themselves as having a disability. Rather than focus on how disability is (or should be) defined, herein we look at how disability identities are constructed as people search for work. We show that people's interactions with employers and employment agencies have important influences on how disability identities are constructed. We borrow from the “doing gender” and “racial formations” paradigms to introduce an interactive approach to looking at how disability identities are constructed. We introduce the concept of disability formation to highlight how disability identities are continually negotiated through interactions with employment agencies and employers. Our findings are based on focus groups with 58 people who self‐identified as having a disability and were working or searching for work.     

Some indications of limits to framing the policy preferences of the civically engaged: Interplay of social capital,race attitudes,and social justice frames

Our experiment, which tested support for a hypothetical social welfare program, found that the civically engaged as a whole were resistant to social justice framing employing universalistic versus particularistic standards. We suggest the lack of a framing effect was due to the use of a preexisting, shared “symbolic racism” frame. Social justice framing did succeed for those whose attitudes toward symbolic racism were ambivalent or neutral. Other factors including sex, income level, political participation, and ideology significantly influenced choice. These results provide some indications of limits to experimental framing of policy preferences of the civically engaged in their institutional settings.     

“It's like he just goes off,BOOM!”: mothers and grandmothers make sense of child‐to‐parent violence

Child to parent violence (CPV) involves continual and cumulative abusive actions perpetrated by children and adolescents towards their parents or caregivers. This abuse produces short‐term distress and ongoing long‐term harmful consequences for parents and their families. Practitioners, researchers and policy‐makers are increasingly challenged to identify, conceptualize and respond to this form of family violence. A major challenge is that parents and caregivers under‐report this abuse so there is a lack of awareness and understanding of their psychological experiences in relation to CPV. This research adopts an interpretative phenomenological approach to explore the psychological experience of CPV. Interviews were conducted with six New Zealand mothers and two grandmothers who all experienced CPV. This abuse was experienced as an ‘emotional bloody roller coaster’ of unconditional love through to hatred; as ‘judgement’ – self‐blame and others' blame of their parenting skills; and the ‘absent father’ in their adolescents' lives was drawn on as an explanation for the abuse. Taken together, these psychological experiences identify the silencing of CPV is related to parents' conflicting emotions towards their children, their thoughts and feelings about themselves and how other people view them, and the impact of an absent father figure in their children's everyday lives.     

Precarious lives and resistant possibilities: the labour of people with learning disabilities in times of austerity

This paper draws on feminist and queer philosophers? discussions of precarity and employment, too often absent from disability studies, to explore the working lives of people with learning disabilities in England in a time of austerity. Recent policy shifts from welfare to work welcome more disabled people into the job market. The reality is that disabled people remain under-represented in labour statistics and are conspicuously absent in cultures of work. We live in neoliberal-able times where we all find ourselves precarious. But, people with learning disabilities experience high levels of uncertainty in every aspect of their lives, including work, relationships and community living. Our research reveals an important analytical finding: that when people with learning disabilities are supported in imaginative and novel ways they are able to work effectively and cohesively participate in their local communities (even in a time of cuts to welfare). We conclude by acknowledging that we are witnessing a global politics of precarity and austerity. Our urgent task is to redress the unequal spread of precaritization across our society that risks leaving people with learning disabilities experiencing disproportionately perilous lives. One of our key recommendations is that it makes no economic sense (never mind moral sense) to pull funding from organisations that support people with intellectual disabilities to work.     

‘I walk from trouble’: exploring safeguards with adults with intellectual disabilities – an Australian qualitative study

People living with intellectual disabilities have a right to be safe from abuse and neglect and have a right to be included in the decision-making process determining safeguards that will affect them. However, the research evidence that could underpin good professional practice in terms of co-producing safeguards against abuse and neglect directly involving people with intellectual disabilities is largely missing. This article, based on qualitative research involving semi-structured interviews conducted during the first half of 2014, seeks to strengthen this evidence base. It reports on the prevention strategies identified by 12 adults with intellectual disabilities about how to stay safe and compares these with the findings of similar research. The article suggests that a comprehensive safeguarding approach comprises both life course-focused safety training and access to assisted decision-making. The article argues that given the plethora of risk situations encountered by people living with intellectual disability, assisted decision-making should take the form of a co-creation process that is situation specific and grounded in everyday life.     

THE IMPACT OF EXTREME OBSERVATIONS ON SIMPLE FORECASTING METHODS*

In general linear modeling, an alternative to the method of least squares (LS) is the least absolute deviations (LAD) procedure. Although LS is more widely used, the LAD approach yields better estimates in the presence of outliers. In this paper, we examine the performance of LAD estimators for the parameters of the first-order autoregressive model in the presence of outliers. A simulation study compared these estimates with those given by LS. The general conclusion is that LAD does not deal successfully with additive outliers. A simple procedure is proposed which allows exception reporting when outliers occur.     

A DISCRETE DYNAMIC OPTIMIZATION MODEL FOR MADE-TO-ORDER COST ANALYSIS

A model is presented that yields optimal production rates for a firm producing a contracted order. The model is unique in that it considers the influence of production rate and learning on total program cost. An application to the specific characteristics of two military production programs is presented. As demonstrated by the application, models of this type may be used as decision-making tools when negotiating the cost impact of contract modifications.