Cost-optimal performance of special reliability tests using prior knowledge

In the present paper we formulate a general statistical decision problem for reliability investigations and its specification for reliability tests with test period termi¬nated by time and failures,

The risk function includes the experimental costs as well as the expected financial expen¬ses caused by the decisions, Interpreted as     

Testing linearity against nonlinear moving average models

Lagrange multiplier (LM) test statistics are derived for testing a linear moving average model against an asymmetric moving average model and an LM type test against an additive smooth transition moving average model. The latter model is introduced in the paper. The small sample performance of the proposed tests are evaluated in a Monte Carlo study and compared to Wald and likelihood ratio statistics. The size properties of the Lagrange multiplier test are better than those of other tests.     

Robust regression:a weighted least squares approach

Robust regression has not had a great impact on statistical practice, although all statisticians are convinced of its importance. The procedures for robust regression currently available are complex, and computer intensive. With a modification of the Gaussian paradigm, taking into consideration outliers and leverage points, we propose an iteratively weighted least squares method which gives robust fits. The procedure is illustrated by applying it on data sets which have been previously used to illustrate robust regression methods.It is hoped that this simple, effective and accessible method will find its use in statistical practice.     

Ordinary least squares estimation of simultaneous equation systems with trended data: further results

The paper gives sufficient conditions for the consistency and asymptotic normality of OLS in linear simultaneous equation systems with trend in some exogenous variables, extending the results of Krämer (1981, 1984) to more general types of trend. When con- sistent, OLS is also shown to have the same limiting distribution as any k-class estimator with a stochastically bounded k, and to produce a consistent estimate of the error variance in the equation.     

Indispensable chairs and comforting cushions — Falls and the meaning of falls in six older persons lives

The aim of the study was to illuminate the meaning of falls for older adults in an everyday perspective. In narrative in-depth interviews, four women and two men, 80–94 years old, told their stories from a daily-life perspective; they had experienced falling several times. The methodological approach used was interpretive phenomenology, in order to grasp the meaning of the participants' situations and everyday practices. The women had learned and used a special technique; they had disciplined their bodies with exercises and training activities, although they suffered from several chronic illnesses. In order to cope with the falling episodes, the women had equipped sofas and chairs with cushions to soften the process of getting up again, whereas the two men sat in a chair moving as little as possible. In handling the falls, each participant showed individual coping strategies and adaptive resources to achieve a life, experiencing a feeling of being well.     

Hard Rock Hallelujah! Empowering Reflexive Political Action on the Internet

The role of the Internet is becoming increasingly significant with regard to political participation and mobilisation. The Internet is a powerful tool in gathering coalitions and organising mobilisation of any kind. However, it is also transforming political styles, forms and the organisational structuring of political activities. In this article, the authors analyse the nature of the political struggle and resistance taking place on the Internet by scrutinising the Finnish Internet protest campaigning against gossip journalism in May 2006. This campaign emerged almost entirely in the Internet environment around the emotional turmoil caused by the publications of the Eurovision Song Contest winner Lordi’s unmasked pictures. This example shows how citizens have adopted the logic of computer‐mediated communication, and how they employ information and communications technology for reflexive individualised politics.     

Support and Control among ‘Friends’ and ‘Special Friends’: Peer Groups' Social Resources as Emotional and Moral Performances amidst Teenagers

Children are often regarded as being supported and controlled by adults, rather than their peer groups. In contrast, drawing on research carried out in Finland, this article considers peers as a resource. Using mainly a 14‐year‐old’s oral narratives, it is shown how the spatial and social context enables and inhibits children’s mutual support and control, reflecting and producing social and moral positions, and inclusion and exclusion. The analysis exploits the performance approach, which stresses children’s active role in the formation of social resources and reconstructs support and control from a child’s point of view.     

Assessing small non-zero perceptions of chance: The case of H1N1 (swine) flu risks

Feelings of invulnerability, seen in judgments of 0% risk, can reflect misunderstandings of risk and risk behaviors, suggesting increased need for risk communication. However, judgments of 0% risk may be given by individuals who feel invulnerable, and by individuals who are rounding from small non-zero probabilities. We examined the effect of allowing participants to give more precise responses in the 0–1% range on the validity of reported probability judgments. Participants assessed probabilities for getting H1N1 influenza and dying from it conditional on infection, using a 0–100% visual linear scale. Those responding in the 0–1% range received a follow-up question with more options in that range. This two-step procedure reduced the use of 0% and increased the resolution of responses in the 0–1% range. Moreover, revised probability responses improved predictions of attitudes and self-reported behaviors. Hence, our two-step procedure allows for more precise and more valid measurement of perceived invulnerability.