A Cross‐National Investigation of the Relationship Between Infant Walking and Language Development

The acquisition of walking has recently been linked with infant language development (Walle & Campos, 2014). If this relation reflects the consequence of an epigenetic event, then it should be present regardless of when the infant typically begins to walk, the infant's culture, and the infant's native language. This study sought to replicate the previously reported link between walking and language development in American infants and investigate whether this relation exists cross‐nationally in typically developing Chinese infants exposed to Mandarin. Urban Chinese infants not only provide a distinct linguistic and cultural population in which to study this relation but also typically begin walking approximately 6 weeks later than American infants. Our results demonstrated that (1) walking infants in both the American and Chinese samples had greater receptive and productive vocabularies than same‐aged crawling infants, (2) differences between crawling and walking infants were proportionally similar in each sample, and (3) the walking‐language relation was present for both noun and non‐noun vocabularies. These findings provide further support of a relation between infant walking onset and language development, independent of age. Avenues for future research of the processes involved in this relation, as well as additional populations of interest to investigate, are discussed.     

An Interview with Franny Lee from SIPX

In this installment of Serial Conversations, Franny Lee, vice president of business development and cofounder of SIPX, is interviewed by Eric Hanson about the company's digital course material service for academic institutions and the evolving digital content marketplace.     

Exact calculation of power and sample size in bioequivalence studies using two one‐sided tests

The number of subjects in a pharmacokinetic two‐period two‐treatment crossover bioequivalence study is typically small, most often less than 60. The most common approach to testing for bioequivalence is the two one‐sided tests procedure. No explicit mathematical formula for the power function in the context of the two one‐sided tests procedure exists in the statistical literature, although the exact power based on Owen's special case of bivariate noncentral t‐distribution has been tabulated and graphed. Several approximations have previously been published for the probability of rejection in the two one‐sided tests procedure for crossover bioequivalence studies. These approximations and associated sample size formulas are reviewed in this article and compared for various parameter combinations with exact power formulas derived here, which are computed analytically as univariate integrals and which have been validated by Monte Carlo simulations. The exact formulas for power and sample size are shown to improve markedly in realistic parameter settings over the previous approximations. Copyright © 2014 John Wiley & Sons, Ltd.     

Letter to the editor by the authors of Exact Calculation of Power and Sample Size in Bioequivalence Studies Using Two One‐sided Tests,Pharmaceutical Statistics,DOI: 10.1002/pst.1666

This article reflects the views of the authors and should not be construed to be those of the US Food and Drug Administration. Copyright © 2015 John Wiley & Sons, Ltd.     

Growing the Volunteer Pool: Identifying Non-Volunteers Most Likely to Volunteer

There are ongoing management and societal challenges affecting volunteering participation. These place a premium on organizations identifying individuals that currently do not volunteer but have the willingness and capacity to do so, the “Potentials”. Supplementing the limited non-volunteer literature, we seek to quantify this potential volunteer pool using constructs aligned to the willingness, capability and availability dimensions from Meijs et al.’s (Volunt Action 8:36–54, 2006) volunteerability framework. Using binary logistic regression testing with a nationally representative sample of Australian volunteers and non-volunteers, we found partial support for the framework’s willingness and capability dimensions determining volunteer status. We then applied a predictive equation to the non-volunteer sample to calculate their percentage likelihood of volunteering, to identify a cohort of “Potential” volunteers. Further testing revealed statistically significant differences between this cohort compared to other non-volunteers based on various interventions for promoting volunteering. The implications of our novel study and an associated research agenda are discussed.

     

From “what works” to “making it work”: A practice perspective on evidence-based standardization in frontline service organizations

Evidence-based standards are becoming increasingly influential in frontline services connected to labor market inclusion of vulnerable citizens. To increase our understanding of standardization in such public service delivery, this study draws on interviews and ethnographic fieldwork from two frontline offices in the Norwegian Labour and Welfare Administration (2017–2018) that use the evidence-based Individual Placement and Support (IPS) standard. Adopting a theoretical perspective of organizational practices, the study highlights two distinct approaches to practicing IPS in the frontline organizations: as a “practice shift” in one organization (i.e., creating and legitimizing radically new service practices involving closer collaboration with employers) and as a “practice revival” in the other (i.e., reinstating more traditional service practices involving a holistic client orientation). Each approach relates to a specific constellation of recruitment practices, dynamics between frontline supervisors and staff, and team integration. The study contributes to the literature in two ways. First, it shows the underlying flexibility embedded in standardization and how standards may be implemented and adapted in ways that may either promote more radical change or revive traditional practices. Second, it nuances positions in the literature on the impact of standards on professional service work. On this basis, the study suggests broadening the attention in research on evidence-based standards in public service delivery from discussions of “what works” to understanding the broader organizational dynamics involved in “making it work.”     

The impact of risk aversion and ambiguity aversion on annuity and saving choices

Journal of Risk and Uncertainty - We analyze the impact of risk aversion and ambiguity aversion on the competing demands for annuities and bequeathable savings using a lifecycle recursive utility...     

Family Transitions,Economic Status,and Voter Turnout Among African‐American Inner‐City Women*

Objectives. We examine voter turnout of inner‐city African‐American mothers, many of whom are single parents and endure long‐term, economic hardship. Previous research suggests that income is a more important factor among these groups than in the general population. We seek to understand the interplay of family structure, income, and voter turnout. Methods. We explore these ideas using panel data on 754 mothers living in Chicago and interviewed as part of the 1967–1976 Woodlawn Community Study. Results. We find that marital status has no effect when women are younger but over time single parents' turnout falls behind that of married parents. This is primarily due to factors related to income and income change. Conclusions. Single mothers have lower rates of participation and, given the high rates of single parenthood in segregated inner‐city neighborhoods, this substantially diminishes the political voice of the nation's poor, contributing to class bias in the electorate.