Multistate Survival Models as Transient Electrical Networks

In multistate survival analysis, the sojourn of a patient through various clinical states is shown to correspond to the diffusion of 1 C of electrical charge through an electrical network. The essential comparison has differentials of probability for the patient to correspond to differentials of charge, and it equates clinical states to electrical nodes. Indeed, if the death state of the patient corresponds to the sink node of the circuit, then the transient current that would be seen on an oscilloscope as the sink output is a plot of the probability density for the survival time of the patient. This electrical circuit analogy is further explored by considering the simplest possible survival model with two clinical states, alive and dead (sink), that incorporates censoring and truncation. The sink output seen on an oscilloscope is a plot of the Kaplan–Meier mass function. Thus, the Kaplan–Meier estimator finds motivation from the dynamics of current flow, as a fundamental physical law, rather than as a nonparametric maximum likelihood estimate (MLE). Generalization to competing risks settings with multiple death states (sinks) leads to cause‐specific Kaplan–Meier submass functions as outputs at sink nodes. With covariates present, the electrical analogy provides for an intuitive understanding of partial likelihood and various baseline hazard estimates often used with the proportional hazards model.     

A visual methodology in pursuit of liveliness: Looking at Whyte's work

The sight of blood and wounds is described as crucial by individuals who self-injure, especially those who practise self-cutting. An understanding of the visual mode is therefore important to get a deeper understanding of why people choose to cut themselves. In this article, visual aspects of first-hand experiences of self-cutting are investigated. Cutting is understood as having a purpose and a function for people who injure themselves; it releases overwhelming feelings or communicates inner states to the individuals themselves and to others. Material was taken from autobiographical accounts describing cutting episodes and from photographs documenting the act. The analysis was carried out using content and discourse analytic methods. The results were interpreted using a discourse theoretical perspective. A semiotic model is proposed to understand the communicative meaning of the acts. An important finding is the role of conceptual metaphors such as ‘the-body-is-a-container’ and ‘feelings are fluid’, which make self-cutting a logical coping strategy. The role of blood as a central sign in the act was manifest in the written and visual accounts of the self-cutting experience. Blood was related to a wide range of meanings, such as realness and true self, and to feelings such as anger and sadness. Through the drawing of blood, feelings were expressed and understood. Blood was also often aestheticised and rearticulated by self-cutters who acknowledged their deviancy as a group in relation to a hegemonic culture. Concurrent themes were the verbal and visual articulations of cutting in a control discourse as a means to regain control or, sometimes, to give oneself up to an experience of chaos.     

Why Do They Leave? Factors Associated With Job Termination Among Personal Assistant Workers in Home Care

Recruiting and retaining an adequate number of personal support workers in home care is both challenging and essential to allowing elders to age in place. A mixed-method, longitudinal study examined turnover in a sample of 261 personal support workers in Maine; 70 workers (26.8%) left their employment in the first year of the study. Logistic regression analysis indicated that younger age and lack of health insurance were significant predictors of turnover. Analysis of telephone interviews revealed three overarching themes related to termination: job not worthwhile, personal reasons, and burnout. Implications of study findings for gerontological social workers are outlined.     

Defining equations for two-level factorial designs

Defining equations are introduced in the context of two-level factorial designs and they are shown to provide a concise specification of both regular and nonregular designs. The equations are used to find orthogonal arrays of high strength and some optimal designs. The latter optimal designs are formed in a new way by augmenting notional orthogonal arrays which are allowed to have some runs with a negative number of replicates before augmentation. Defining equations are also shown to be useful when the factorial design is blocked.     

The Impact of the 1-Year-Residency Requirement on Students Preferring Part-Time Study

This article examines the effect of a 1-year-residency requirement on master of social work students’ psychophysical health, general well-being, perceived workload, and grade point average. The study contributes to the existing research in two ways. First, the sample size was sufficiently large to detect important differences between part-time and full-time students. Second, the study addressed the previously neglected issue of whether students who prefer to attend school on a part-time basis are negatively affected by a 1-year-residency policy. The study found no difference in outcome between part-time and full-time students who were enrolled in first-year courses. But when part-time students were obliged to complete their second-year courses on a full-time basis, their academic performance suffered compared with that of 2-year students.