An application of taguchi's methods reconsidered

Two aspects of Taguchi's methods for analyzing parameter design experiments that can be improved upon are considered. It is shown how using interaction graphs instead of marginal graphs, and how using the sample variance instead of a signal-to-noise ratio, can lead to product designs that are more robust to variation. The advantages of the alternative analysis will be illustrated by reanalyzing a case study considered by Barker (1986).     

Hospital social workers' assessment processes for children at risk: positions in and contributions to inter-professional teams

This article explores hospital social workers' assessment processes for children at risk within the context of inter-professional teams working in child hospital care in Sweden. Based on qualitative interviews, the study discusses how assessment processes for children at risk can be understood from a professionalism perspective. Three institutionalized norms—juridical, therapeutic, and medical, building on different knowledge systems—are analyzed in relation to the three positions taken by hospital social workers as team members—active, reflective, or passive—leading to different kinds of actions in the assessment processes. The outlined norms and the positions taken involve consequences for the children and their families, but also pose questions for the future professionalization efforts of hospital social work.     

On Mixture Failure Rates Ordering

Mixtures of increasing failure rate distributions (IFR) can decrease at least in some intervals of time. Usually, this property can be observed asymptotically as t → ∞. This is due to the fact that the mixture failure rate is “bent down” compared with the corresponding unconditional expectation of the baseline failure rate, which was proved previously for some specific cases. We generalize this result and discuss the “weakest populations are dying first” property, which leads to the change in the failure rate shape. We also consider the problem of mixture failure rate ordering for the ordered mixing distributions. Two types of stochastic ordering are analyzed: ordering in the likelihood ratio sense and ordering in variances when the means are equal.     

Experimental design for four mixture components with process variables

The experimental design to model the response of a mixture in four components in the presence of process variables is considered. Two different blocks of blends that are orthogonal for linear or quadratic blending are D-optimized. The two orthogonal blocks of blends are generalized and D-optimized in some cases (and possibly Doptimized in others) to deal with restrictions on the blending component proportions. The pair of orthogonal D-optimal blocks of blends can be used with an arbitrary number of process variables, and requires a reduced number of observations.     

Substantive Meanings of Missing Data in Family Research: Does “Don't Know” Matter?

In this article we analyze “don't know” responses from three sources of longitudinal data: the National Longitudinal Study of Adolescent Health (n = 14,528), the National Survey of Families and Households (n = 5,488), and the National Health Interview Survey Second Longitudinal Study of Aging (n = 1,131). We asked whether these responses are meaningful in family research, and, if so, how evaluating these responses can contribute to the development of theory, the discovery of novel findings, and identification of sensible methods for analyzing these nebulous responses. We found that “don't know” responses to questions about family members predicted less educational attainment, poor marital quality, and earlier mortality. Results suggest that this response category may have substantive meanings rather than indicating neutral responses or being missing data.     

Representing representations: the ethics of filming at Ground Zero

In this paper I analyse the ethical challenges that informed the production and filming of my documentary September Signs and Symbols. The film focuses on the material objects that commemorate the terrorist attacks of 9/11, and how this memorabilia circulates in New York City. The film explores how these objects have come to be complex signifiers containing within them the possibility for a range of meanings for people who create them, sell them, collect them, and use them and this paper reflects on the complex ethics of filming at Ground Zero – a highly charged political and cultural site. I analyse the ethics of representing a hyper‐represented space, the necessity for self‐reflexivity in the process of demystifying signifiers that have had meaning appended to them and my own complicity in the dialectic of production and consumption that informs any engagement with the objectified discourse of September 11th.     

Trapped in the Working Class? Prospects for the Intergenerational (Im)Mobility of Latino Youth

Opportunities for upward mobility have been declining in the United States in recent decades. Within this context, I examine the mobility trajectories of a contemporary cohort of 1.5‐, second‐, and third‐plus‐generation Latino youth. Drawing on survey data from California that accounts for the precarious legal status of many 1.5 generation immigrants, I find that Latino youths' patterns of postsecondary enrollment and employment do not differ by generation since migration. Additionally, I do not find evidence of racial/ethnic barriers to Latino youths' enrollment in less selective colleges and participation in the labor market. Yet, given the low socioeconomic origins of many Latino youth and their correspondingly low 4‐year college enrollment rates, only a small proportion will likely enjoy upward mobility through jobs that require a bachelor's degree. Overall, the cohort of Latino youth coming of age during the Great Recession is poised to experience working‐class stagnation. This group's future access to economic and political positions of power will likely be limited by their low enrollment rates in 4‐year colleges in general, but in selective postsecondary institutions in particular.