Using multiple imputation to estimate cumulative distribution functions in longitudinal data analysis with data missing at random

In longitudinal clinical studies, after randomization at baseline, subjects are followed for a period of time for development of symptoms. The interested inference could be the mean change from baseline to a particular visit in some lab values, the proportion of responders to some threshold category at a particular visit post baseline, or the time to some important event. However, in some applications, the interest may be in estimating the cumulative distribution function (CDF) at a fixed time point post baseline. When the data are fully observed, the CDF can be estimated by the empirical CDF. When patients discontinue prematurely during the course of the study, the empirical CDF cannot be directly used. In this paper, we use multiple imputation as a way to estimate the CDF in longitudinal studies when data are missing at random. The validity of the method is assessed on the basis of the bias and the Kolmogorov–Smirnov distance. The results suggest that multiple imputation yields less bias and less variability than the often used last observation carried forward method. Copyright © 2013 John Wiley & Sons, Ltd.     

Who Reads Catholic Newspapers? Exploring Readership in a Changing Industry

Newspapers published by Roman Catholic dioceses represent a large and unexplored part of the religious publishing industry. This study attempts to shed light on the challenges these publications face by examining the readership of a diocesan newspaper in a large Catholic diocese in the Mid-Atlantic region of the United States. Based on a comprehensive survey of 24,278 Roman Catholic households from 27 parishes throughout the diocese, this study finds a large gap in readership and engagement between older and younger readers, raising important strategic and pastoral questions for the newspaper in the years to come.     

Sexual Well-Being in Older Women: The Relevance of Sexual Excitation and Sexual Inhibition

The aim of this study was to use the dual control model of sexual response (DCM) to investigate variation in sexual well-being among women 50 years of age and older. Data from 185 women 50 years of age and older (M = 59.46, SD = 6.96) were used to examine the relationships between sexual excitation (SE) and sexual inhibition (SI) and their lower-order factors to indicators of sexual well-being (i.e., sexual functioning, satisfaction, distress, frequency of sexual activity, and breadth of sexual behavior). Possible moderating factors were also explored. Independently, SE and SI were associated with the majority of the indicators of sexual well-being, and the directions of associations were consistent with the tenets of the DCM. SE and SI lower-order factors were significant predictors of sexual function, satisfaction, and frequency of sexual activity. Sexual distress was predicted more strongly by SI factors and breadth of sexual behavior by one SE lower-order factor (arousability). Partner physical and mental health and participant’s own mental health were identified as moderating variables of these associations. Findings of this study are discussed considering the contribution of the DCM to understanding the role of diversity in older women’s sexual well-being.     

College and University Health Care Professionals: An Expanding Team

Abstract

Factors contributing to students' compliance with mass vaccination programs during meningococcal outbreaks have not been well described. A 1997 mass vaccination campaign at Michigan State University provided an opportunity to study such factors. Of 34 024 students in the target population, 17 538 (51.5%) were vaccinated in 5 days. Vaccination rates were higher for women (47.9%) than for men (43.1 %) and higher for on-campus residents (65.3%) than for off-campus residents (35.6%). For each year of students' age beyond 19, the adjusted odds of vaccination were reduced by 0.82. Adjusted odds ratios for vaccination, with White students as the reference group at 1.0, were 1.33 for Asian American students, 0.97 (not significant) for Hispanic students, 0.82 for African American students, and 0.80 for Native American students. Students from the Colleges of Business, Engineering, Communication, and Natural Science had the highest vaccination rates; those from the College of Arts and Letters had the lowest rates.     

VOTING AND IMITATIVE BEHAVIOR

Political behavior generates private benefits by helping people fit in with desired friends. A voter imitates other voters, but at the same time they imitate him. An equilibrium solution requires exogenous variables: the narrow self-interest of the participants. The reduced form makes one's vote a function of the narrow self-interest of others as well as one's own. In accord with the model, a person's party identification depends on his ethnic group's current income and its income in 1909 as well as his own income.     

Inventing adulthoods: a biographical approach to understanding youth citizenship

Traditionally adulthood and citizenship have been synonymous. Yet adulthood is changing. In this paper we explore how young people's evolving understandings of adulthood may contribute towards an understanding of citizenship within the broader context of increasingly extended and fragmented transitions. The paper draws on a unique qualitative longitudinal data set in which 100 young people, from contrasting social backgrounds in the United Kingdom, have been followed over a five‐year period using repeat biographical interviews. We present first the themes that emerged from a cross‐cut analysis of the first of three rounds of interviews distinguishing between relational and individualised understandings of adulthood. We then present a model we developed to capture the ways that young people sought out opportunities for competence and recognition in different fields of their lives. Finally a case study that follows a young woman through her three interviews illustrates how these themes can appear in an individual trajectory. We offer the model and case study as a way of exploring a more subjective approach to citizenship in which participation is not deferred to some distant future in which economic independence is achieved, but is understood as constantly constructed in the present.     

Leader behaviors and career derailment potential: A multi-analytic method examination of rating source and self–other agreement

Based on extensive research that views leadership as a multi-faceted phenomenon, we examined how the relationships between task-oriented and relationship-oriented leader behaviors and career derailment potential vary by observer perspective. We present findings using three different analytical techniques: random coefficient modeling (RCM), relative weight analysis (RWA), and polynomial regression (PR). RCM findings suggest that self-, direct report, peer, and supervisor ratings of leader behaviors differ and are associated with career derailment potential. RWA results indicate that self-ratings matter the least, whereas peer ratings of leader behaviors typically matter the most in predicting career derailment potential. PR analyses indicate that career derailment potential is lowest when self-ratings are lower than other ratings of leader behaviors and/or when self–other ratings converge on higher, rather than lower, ratings of leader behaviors. Implications for leadership and self–other agreement research and professional practice are discussed.     

Application of classification trees to the habitat preference of upland birds

This paper investigates the application of classification tree methodology to the bird habitat associations of the red grouse in the south Pennines of England. The effectiveness of this classification will be investigated using the kappa coefficient. Although the results for these data are disappointing, the methodology seems to have potential for this kind of problem.     

Why some Conferences are Difficult: a Study of the Professionals' Experience of Some Initial Child Protection Conferences

The views of 261 professionals attending 36 initial child protection conferences with parental participation were collected by means of a questionnaire. Overall, the professionals found the involvement of parents beneficial to the consideration of risk and the decision-making process, with some provisos. The data revealed that most of the negative responses arose from one third of the conferences, and that these conferences shared particular features relating to family profile and certain conference characteristics. The nature of the difficulties is identified and explored, especially with regard to the ambiguities and the uncertainties involved in risk assessments which contributed to the professionals, negative experiences, and which seemed to be heightened by the parents' presence.