Confidence intervals for the difference between independent binomial proportions: comparison using a graphical approach and moving averages

This paper uses graphical methods to illustrate and compare the coverage properties of a number of methods for calculating confidence intervals for the difference between two independent binomial proportions. We investigate both small‐sample and large‐sample properties of both two‐sided and one‐sided coverage, with an emphasis on asymptotic methods. In terms of aligning the smoothed coverage probability surface with the nominal confidence level, we find that the score‐based methods on the whole have the best two‐sided coverage, although they have slight deficiencies for confidence levels of 90% or lower. For an easily taught, hand‐calculated method, the Brown‐Li ‘Jeffreys’ method appears to perform reasonably well, and in most situations, it has better one‐sided coverage than the widely recommended alternatives. In general, we find that the one‐sided properties of many of the available methods are surprisingly poor. In fact, almost none of the existing asymptotic methods achieve equal coverage on both sides of the interval, even with large sample sizes, and consequently if used as a non‐inferiority test, the type I error rate (which is equal to the one‐sided non‐coverage probability) can be inflated. The only exception is the Gart‐Nam ‘skewness‐corrected’ method, which we express using modified notation in order to include a bias correction for improved small‐sample performance, and an optional continuity correction for those seeking more conservative coverage. Using a weighted average of two complementary methods, we also define a new hybrid method that almost matches the performance of the Gart‐Nam interval. Copyright © 2014 John Wiley & Sons, Ltd.     

Adding insult to injury: development and initial validation of the Partner-Directed Insults Scale

Women who are verbally abused by their intimate male partners suffer serious mental health consequences and often experience physical violence in their relationship. Despite the importance of studying verbal abuse, no previous research has investigated the specific content of the insults men use to derogate their partners. We present the development and initial validation of a new measure designed to assess the specific content of insults used by men against their intimate partners. In a preliminary study, we used feedback from battered women, along with a review of the relevant literature, to identify specific insults for inclusion in the Partner-Directed Insults Scale (PDIS). We administered the PDIS to a sample of United States participants (Study 1) and a sample of New Zealand participants (Study 2), allowing for a cross-national investigation of the specific insults that men use to derogate their partners. The results demonstrate the practical need for such a scale and provide evidence for the discriminant validity of the PDIS by documenting that men's use of insults predicts their use of controlling behaviors and physical violence.     

Poverty among long-term united states immigrants

In this paper we analyze the economic and social characteristics of impoverished long-term immigrants. We investigate in what ways this group differs from poor natives and what factors contribute towards the economic success or failure of long-term immigrants. We found that poor long-term immigrants are more likely than poor natives to live in central cities and to work full-time, and less likely to live in non-female-headed households. Long-term immigrants from refugee countries are over six times as likely ana immigrants from Mexico over three times as likely to be poor as long-term immigrants from Europe, even after considering family structure, education, and citizenship. Also, immigrants who live in single female-headed families are considerably more likely to be poor than those who live in married-couple families, and immigrants in extended families are less likely to be poor than those who are not. The welfare reform bill redefines eligibility criteria for immigrants with respect to participation in Food Stamps, SSI and AFDC. Because of the high risk of poverty among long-term immigrants (particularly refugees), their low rates of naturalization, and the predominance of extended families, it is likely that long-term immigrants will suffer economic setbacks as a result of welfare reform. We posit that this economic hardship is exacerbated by the fact that anti-poverty policies are not tailored to the circumstances of long-term immigrants, many of whom already work full-time     

Analysis of multivariate categorical data with misclassification errors by triple sampling schemes

Previous work has been carried out on the use of double-sampling schemes for inference from categorical data subject to misclassification. The double-sampling schemes utilize a sample of n units classified by both a fallible and true device and another sample of n₂ units classified only by a fallible device. In actual applications, one often hasavailable a third sample of n₁ units, which is classified only by the true device. In this article we develop techniques of fitting log-linear models under various misclassification structures for a general triple-sampling scheme. The estimation is by maximum likelihood and the fitted models are hierarchical. The methodology is illustrated by applying it to data in traffic safety research from a study on the effectiveness of belts in reducing injuries.     

Examples of sports-based youth development programs

The authors provide examples of sports-based youth development programs and offer information about program mission and vision, program design and content, evaluation results, and program sustainability. The four sports-based youth development programs presented are Harlem RBI, Tenacity, Snowsports Outreach Society, and Hoops & Leaders Basketball Camp. These programs serve diverse audiences with diverse missions, but all are focused on using sports to develop life skills and facilitate learning. Harlem RBI serves boys and girls ages seven to eighteen living in East Harlem. The program combines baseball, academic, and enrichment programs with the overall goal that participants who enter the program as vulnerable children graduate as resilient young adults. Tenacity, a nonprofit organization with headquarters in Boston, uses tennis to attract and retain students who particiate in a high-quality academic support and physical fitness program. The mission of Snowsports Outreach Society, based in Vail, Colorado, is building character in at-risk and underprivileged youth to develop their decision-making ability for healthy and successful life experiences. Hoops & Leaders Basketball Camp is a youth mentoring and leadership development program that offers summer camp experiences to improve the lives of at-risk urban youth in New York City. It uses the game of basketball to provide youth with caring mentors, develop leadership skills, and offer exposure to different educational and career paths.