A survey of tests for exponentiality

A wide selection of tests for exponentiality is discussed and compared. Power computations, using simulations, were done for each procedure. Certain tests (e.g. Gnedenko (1969), Lin and Mudholkar (1980), Harris (1376), Cox and Oakes (1384), and Deshpande (1983)) performed well for alternative distributions with non-monotonic hazard rates, while others (e.g. Deshpande (1983), Gail and Gastwirth (1978), Kolmogorov-Smirnov (LillViefors (1969)), Hahn and Shapiro (1967), Hollander and Proschan (1972), and Cox and Oakes (1984)) fared well for monotonic hazard rates. Of all the procedures compared, the score test presented in Cox and Oakes (1984) appears to be the best if one does not have a particular alternative in mind.     

Managing Wildfire Events: Risk‐Based Decision Making Among a Group of Federal Fire Managers

Managing wildfire events to achieve multiple management objectives involves a high degree of decision complexity and uncertainty, increasing the likelihood that decisions will be informed by experience‐based heuristics triggered by available cues at the time of the decision. The research reported here tests the prevalence of three risk‐based biases among 206 individuals in the USDA Forest Service with authority to choose how to manage a wildfire event (i.e., line officers and incident command personnel). The results indicate that the subjects exhibited loss aversion, choosing the safe option more often when the consequences of the choice were framed as potential gains, but this tendency was less pronounced among those with risk seeking attitudes. The subjects also exhibited discounting, choosing to minimize short‐term over long‐term risk due to a belief that future risk could be controlled, but this tendency was less pronounced among those with more experience. Finally, the subjects, in particular those with more experience, demonstrated a status quo bias, choosing suppression more often when their reported status quo was suppression. The results of this study point to a need to carefully construct the decision process to ensure that the uncertainty and conflicting objectives inherent in wildfire management do not result in the overuse of common heuristics. Individual attitudes toward risk or an agency culture of risk aversion may counterbalance such heuristics, whereas increased experience may lead to overconfident intuitive judgments and a failure to incorporate new and relevant information into the decision.     

Physical and mental health inequalities between native and immigrant Swedes

To study health inequalities between native and immigrant Swedes, we investigated differences in self‐rated health (SRH), mental wellbeing (MW), common symptoms (CS), and persistent illness (PI), and if socioeconomic status (SES), negative status inconsistency, or social support could account for such differences. A secondary analysis was conducted on questionnaire data from a random adult population sample of 4,023 individuals and register data from Statistics Sweden. χ² tests and binary logistic regressions were used to identify health differences and study these after accounting for explanatory variables. Compared with natives, immigrants more commonly reported negative status inconsistency, poorer SES, and poorer social support as well as poor SRH, very poor MW, and high level of CS but not PI. Significant differences were accounted for by work‐related factors and social support. We encourage future research to address how pre‐ and peri‐migration factors relate to immigrants’ post‐migration SES, social support, and health status.

Policy Implications

• Given the relationship between work‐related factors (employment status, hours worked per week, and income) and all health outcomes in this study, labour market interventions that facilitate the integration of immigrants into the labour market, and into occupations that better correspond with their capacity, will arguably have public health benefits.
• Feelings of loneliness was, in our study, important in accounting for immigrants’ poorer self‐rated health compared with natives’. Therefore, we endorse interventions that facilitate immigrants’ social networking and integration and thereby reduce feelings of loneliness.
• Common physical and mental symptoms may be important indicators of health and we, thus, suggest these to be taken into account when developing ill‐health prevention programmes.