Equivalence Tests Can Enhance Environmental Science and Management

Tests of point hypotheses are common in observational environmental studies, but there is concern about their appropriateness. Exhortations to restrict sample sizes on the basis of a power analysis for such tests may fail to satisfy the environmental professional, because sample sizes are not always easily controlled. Testing of interval hypotheses via equiva-lence test procedures offers a way of testing meaningful hypotheses and of giving effect to the precautionary principle. An example is given which concerns mining impacts on stream benthic invertebrate communities, and includes calculation of Bayesian posterior probabilities.     

Does FDI Guarantee the Stability of International Capital Flows? Evidence from Malaysia

The conventional wisdom is that crises are largely due to swings in short‐term capital. Economies that finance their current account deficits mainly via foreign direct investment (FDI) are therefore seen as being less susceptible to a crisis. The analysis in this article, backed up by some empirical evidence drawn from Malaysia, challenges the casual presumption that the switch towards FDI alone will automatically imply that extreme capital instability will become a thing of the past.     

Beyond the Activist Ghetto: A Deductive Blockmodelling Approach to Understanding the Relationship between Contact with Environmental Organisations and Public Attitudes and Behaviour

Current research on the behavioural impacts of social movements tends to focus on their influence on those most intensely involved. Consequently it overlooks the impacts that social movement organisations might have on those outside the activist ghetto. To begin to address this gap in the literature, this article examines the relationship between contact with environmental organisations and public attitudes and behaviour. Monitoring the electricity use of 72 households has facilitated analysis of its association with their environmental attitudes and contact with environmental organisations. Although standard statistical approaches fail to uncover a relationship between contact with environmental organisations and attitudes and behaviour, a deductive blockmodelling approach tells a different story. Low household electricity use is associated with households sharing pro-environmental attitudes and contact with environmental organisations. High energy use is associated with households not sharing any of these; and moderate energy use is associated with a moderate degree of sharing. Our findings reveal the need for systematic studies of environmental movement organisations' impact on the public's pro-environmental behaviours.     

Transport-related social exclusion amongst older people in rural Southwest England and Wales

Rural dwelling and older age are both associated with a higher risk of social exclusion, with accessibility identified as having an important facilitating role. The interactions between transport-related exclusion and older age, particularly in a rural context, are considered though analysis of quantitative and qualitative data collected from over 900 older persons living in rural areas of Southwest England and Wales. Although few respondents reported feeling excluded within their communities, more reported difficulties in accessing specific necessary and discretionary activities, including specialist hospitals and cinemas. Analysis revealed that car availability is not a strong indicator of overall inclusion, although non-availability was important in limiting access to particular types of location. It is concluded that the relatively short travel distances required to access community activities was a key factor in the high levels of community inclusion. However, the car-dependent nature of travel overall means that there is a rising risk of mobility-related exclusion in rural areas, particularly amongst the oldest old. Greater consideration needs to be given to more formalised lift-giving as a transport solution, along with greater attention to mobility needs by sector-specific service providers, such as the health sector.     

Exact Confidence Intervals for Proportions Estimated by Group Testing with Different Group Sizes

Group testing is the process of combining individual samples and testing them as a group for the presence of an attribute. The use of such testing to estimate proportions is an important statistical tool in many applications. When samples are collected and tested in groups of different size, complications arise in the construction of exact confidence intervals. In this case, the numbers of positive groups has a multivariate distribution, and the difficulty stems from a lack of a natural ordering of the sample points. Exact two‐sided intervals such as the equal‐tail method based on maximum likelihood estimation, and those based on joint probability or likelihood ratio statistics, have been previously considered. In this paper several new estimators are developed and assessed. We show that the combined tails (or Blaker) method based on a suitable ordering statistic, is the best choice in this setting. The methods are illustrated using a study involving the infection prevalence of Myxobolus cerebralis among free‐ranging fish.     

Family Therapy and Young Children A Case of Potential Child Abuse

Parental distress often places young children in grave danger of physical abuse. In this paper a family therapy approach is used with a single parent family with young children where physical abuse is a distinct possibility. The paper outlines some of the basic concepts used in the therapy and focuses on the effective use of relabelling as a means to diffuse anger and open the way for constructive change within the family system.