Does Marital History Matter? Marital Status and Wealth Outcomes Among Preretirement Adults

Data from the 1992 Health and Retirement Survey are used to specify ordinary least squares (OLS) regression models predicting wealth. Separate models are estimated for men and women. The results indicate that individuals who are not continuously married have significantly lower wealth than those who remain married throughout the life course. Remarriage offsets the negative effect of a marital dissolution. There are significant gender differences in these effects. The results demonstrate that accounting for the sequence of marital events provides a detailed picture of the life paths that lead to wealth heterogeneity among the older population.     

Long cycles in hypercubes with optimal number of?faulty vertices

Let f(n) be the maximum integer such that for every set F of at most f(n) vertices of the hypercube Q _n , there exists a cycle of length at least 2 ⁿ ?2|F| in Q _n ?F. Casta?eda and Gotchev conjectured that $f(n)=\binom{n}{2}-2$ . We prove this conjecture. We also prove that for every set F of at most (n ²+n?4)/4 vertices of Q _n , there exists a path of length at least 2 ⁿ ?2|F|?2 in Q _n ?F between any two vertices such that each of them has at most 3 neighbors in F. We introduce a new technique of potentials which could be of independent interest.     

Conditional MSE-based discrimination of the sample mean and the post-stratification estimator in population sampling

Whenever a random sample is drawn from a stratified population, the post-stratification estimator $\tilde X$ usually is preferred to the sample mean $\tilde X$ , when the population mean is to be estimated. This is due to the fact that the variance of $\tilde X$ is asymptotically smaller than that of $\tilde X$ , while both estimators are asymptotically unbiased. However, this only holds looking at post-stratification unconditionally, when strata sample sizes are random. Conditioned on the realized sample sizes, the MSE of $\tilde X$ can be higher than that of $\tilde X$ which means that $\tilde X$ should be preferred to $\tilde X$ , even if it is biased. The conditional MSE difference of $\tilde X$ and $\tilde X$ is estimated, and using this estimation and its variance a heuristic test based on the Vysochanskiî-Petunin inequality is derived.     

Mental health literacy,stigma, and help-seeking behaviors among male college students

Objective: Mental health literacy (MHL) is low in college-aged men potentially resulting in impaired mental wellbeing. This study assessed MHL, psychosocial determinants, and help-seeking behaviors among male university students. Participants: Male undergraduate and graduate students were surveyed in Spring 2017 (n = 1,242) at a large southeastern university in the United States. Methods: Preexisting validated scales for MHL, psychosocial determinants, and help-seeking intention were used in measurement and demographic variables were collected. T-tests and one-way ANOVA were performed to measure differences between groups. Results: Participants showed low scores for all constructs with statistically significant differences between undergraduate and graduate students, as well as between races and major classifications. Undergraduate men had moderate MHL and low intentions to seek professional care. Conclusions: Interventions focusing on increasing mental health knowledge and improving beliefs can improve MHL among male college students. Further, interventions should be tailored for racial groups and major classifications.     

What Happens on Islands,doesn’t Stay on Islands: Patterns of Synchronicity in Mosquito Nuisance and Host-Seeking Activity between a Mangrove Island and Adjacent Coastal Development

Urban Ecosystems - Coastal development is expanding globally in response to mass human migration, yet urban planning guidelines often overlook the problems that human encroachment on or near...     

On a neglected aspect of portfolio choice: the role of the invested capital

In return-based portfolio choice models à la Markowitz, the amount of capital invested does not play a role, while in expected utility models it does. The aim of this paper is to bring out the connection between the amount of capital invested and the portfolio formation. In a general one-period framework, which also comprises illiquid assets held by the investor and the period income, we present results in finding the optimal portfolio weights and study the influence of the invested capital, the illiquid assets and the income on the portfolio formation. Special emphasis is put on HARA utility functions and the dependence of the amount invested risklessly on the invested capital. As a side result, we find that Markowitz portfolio choice is not fully compatible with expected utility reasoning.