Weibull lagged effect step-stress model with competing risks

In many survival analysis studies, failure can come from one of several competing risks. Additionally, where survival times are lengthy, researchers can increase stress levels to cause units to fail faster. One type of accelerated testing is a step-stress test where the increase is presented in quantum jumps at predetermined time points. If the impact of the increase is not immediately attained, an interim lag period is modeled. In this article, we propose a two-competing risk step-stress model with a lag period where each independent risk follows a Weibull lifetime distribution, the interim lag period is linear, and the attainment point is assumed known. We obtain the maximum likelihood estimators and the observed information matrix; we construct confidence intervals and provide estimates of coverage probabilities using large sample theory, percentile bootstrap, and bias-corrected accelerated (BCa) bootstrap methods.     

Effects of a Mid- to Late-Life Parental Divorce on Adult Children

There is a dearth of research on whether and how a later-life parental divorce influences the lives of adult children. Through qualitative interviews with 40 adult children of divorce (ACD)—those whose parents divorced after they were 18 years of age—ACD were asked to discuss their experience of the parental divorce. There were commonalities experienced by the ACD. However, only half of the ACD were initially affected negatively by their parents’ divorce, whereas the other half did not have a tough time initially. Factors including being “put in the middle,” along with strained parent–child relationships, were found to have the potential to affect one’s experience.     

Publisher Correction to: An integrated dietary assessment increases feeding event detection in an urban carnivore

Urban Ecosystems - The Publisher would like to correct the introduced formatting errors on the caption of Figure 1 and in the data in Table 2.     

An integrated dietary assessment increases feeding event detection in an urban carnivore

Urban Ecosystems - Urbanisation radically changes habitats and alters available resources. Populations of large, highly mobile species are often extirpated at the urban-wildland interface, while...     

Adult Sibling Relationships in the Context of a Mid- to Late-Life Parental Divorce

There has been much research on the influence of parental divorce on children, but less is known about whether and how a later-life parental divorce influences the lives of adult children. Through qualitative interviews with 40 adult children of divorce—those whose parents divorced after they were 18 years of age—adult sibling relationships were explored to determine if a mid- to late-life parental divorce affects the adult sibling relationship. The majority of participants reported that their sibling relationships were not negatively affected by the parental divorce; however, a minority of participants noted that their adult sibling relationships were negatively affected, especially if they “took sides” during the parental divorce.     

Using a gender perspective to explore forest dependence in rural HIV/AIDS-affected Malawian households

Throughout Sub-Saharan Africa, forest resources play a crucial role in enabling households to control and adapt to HIV/AIDS; however, little is known about how the disease impacts the gendered use of forest resources. This exploratory study characterizes how the dependence on forest resources changes for female and male respondents in HIV/AIDS-affected households in Malawi through three phases: before HIV was known to be present; during HIV-related morbidity; and after AIDS-related mortality. The results presented for female and male respondents in this paper are strikingly similar, and many respondents report that there are no longer any traditional gender roles for household tasks due to HIV/AIDS. Therefore, we question the thinking around gender-specific forest-related interventions for HIV-affected people. Moreover, given the gendered knowledge base that must surround resource use, what do these changes in traditional roles mean for sustainable forest resource use in the future? Further research on knowledge transmission around these resources is warranted.