Local and landscape drivers of bird abundance,species richness,and trait composition in urban agroecosystems

Urban Ecosystems - Urban gardens, or spaces that include vegetables, fruit trees, and ornamental plants, can support bird species and communities by providing food and nesting habitat within urban...     

School outcomes for homeless children: differences among sheltered,doubled-up,and poor,housed children

Some definitions of child homelessness include the category of children who are doubled-up with others due to loss of housing or economic hardship, while others do not. Are doubled-up children more like children in shelters or children who are poor but housed? A quasi-experimental comparison group design was used to test empirically for differences in school mobility, school attendance, and reading and mathematics achievement among three groups of sheltered, doubled-up, and poor, housed children, respectively, with each group containing 49 students. Sheltered students were found to have significantly higher levels of school mobility and significantly lower rates of school attendance than students in the other two groups. An elaboration of the continuum of risk model is proposed to differentiate experiences of sheltered and doubled-up students. Recommendations are made for policy responses as well as future research.     

Stereotypes,Emotions, and Behaviors Toward Lesbians,Gay Men,Bisexual Women,and Bisexual Men

The utility of the Stereotype Content Model (Fiske, Cuddy, Glick, & Xu, 2002) and the Behaviors from Intergroup Affect and Stereotypes map (Cuddy, Fiske, & Glick, 2007) were examined in the context of heterosexuals’ attitudes toward sexual minorities. Heterosexual adults completed a survey measuring stereotypes, emotions, and behavioral tendencies toward lesbians, gay men, bisexual women, and bisexual men. Stereotype content differed across groups and showed “gendered” and “valenced” effects on emotions and behavioral tendencies. Competence predicted behaviors for men, whereas warmth and competence predicted behaviors for women, and, for the most part, more was better. Admiration and contempt mediated most of these relationships across most subgroups, but pity and envy played smaller roles for some subgroups. Across all groups, competence played a more predictive role than warmth.     

The impact of missing data and how it is handled on the rate of false-positive results in drug development

In drug development, a common choice for the primary analysis is to assess mean changes via analysis of (co)variance with missing data imputed by carrying the last or baseline observations forward (LOCF, BOCF). These approaches assume that data are missing completely at random (MCAR). Multiple imputation (MI) and likelihood-based repeated measures (MMRM) are less restrictive as they assume data are missing at random (MAR). Nevertheless, LOCF and BOCF remain popular, perhaps because it is thought that the bias in these methods lead to protection against falsely concluding that a drug is more effective than the control. We conducted a simulation study that compared the rate of false positive results or regulatory risk error (RRE) from BOCF, LOCF, MI, and MMRM in 32 scenarios that were generated from a 2(5) full factorial arrangement with data missing due to a missing not at random (MNAR) mechanism. Both BOCF and LOCF inflated RRE were compared to MI and MMRM. In 12 of the 32 scenarios, BOCF yielded inflated RRE compared with eight scenarios for LOCF, three scenarios for MI and four scenarios for MMRM. In no situation did BOCF or LOCF provide adequate control of RRE when MI and MMRM did not. Both MI and MMRM are better choices than either BOCF or LOCF for the primary analysis.     

Economic Circumstances and Family Outcomes: A Review of the 1990s

This review documents the economic context within which American families lived in the 1990s. Despite nearly full employment and growing income and wealth for many Americans, problem areas included persistent racial gaps in economic well‐being, growing inequality, and declining wages for young men. Women showed stronger income growth than men in the decade, and 2‐earner households became increasingly associated with advantage. We review the consequences of these trends and of economic well‐being generally on 4 dimensions of family outcomes: family formation, divorce, marital quality, and child well‐being. Despite hypotheses suggesting that women's earnings might have different effects on family outcomes than men's earnings, generally the review supports the expectation that both men's and women's economic advantage is associated with more marriage, less divorce, more marital happiness, and greater child well‐being. Important issues regarding measurement, reciprocal relations between family structure and economic well‐being, and race and gender effects remain unresolved.     

Improved estimation for the autocovariances of a Gaussian stationary process

For a Gaussian stationary process with mean μ and autocovariance function γ(·), we consider to improve the usual sample autocovariances with respect to the mean squares error (MSE) loss. For the cases μ=0 and μ≠0, we propose sort of empirical Bayes type estimators Γ? and Γ?, respectively. Then their MSE improvements upon the usual sample autocovariances are evaluated in terms of the spectral density of the process. Concrete examples for them are provided. We observe that if the process is near to a unit root process the improvement becomes quite large. Thus, consideration for estimators of this type seems important in many fields, e.g., econometrics.     

A pilot study combining Go4Life® materials with an interactive voice response system to promote physical activity in older women

ABSTRACT

Telephone-based interactive voice response (IVR) systems could be an effective tool for promotion of physical activity among older women. To test IVR feasibility, we enrolled 30 older women in a 10-week physical activity intervention designed around National Institute on Aging (NIA) Go4Life® educational materials with IVR coaching. Participants (mean age = 76 years) significantly increased physical activity by a mean 79 ± 116 (SD) minutes/week (p < .001). Participants reported that the Go4Life® materials, pedometer, and IVR coaching (70% reported easy technology) were useful tools for change. This pilot study demonstrates IVR acceptability as an evidence-based physical activity program for older women.