Efficient Augmented Inverse Probability Weighted Estimation in Missing Data Problems

When analyzing data with missing data, a commonly used method is the inverse probability weighting (IPW) method, which reweights estimating equations with propensity scores. The popularity of the IPW method is due to its simplicity. However, it is often being criticized for being inefficient because most of the information from the incomplete observations is not used. Alternatively, the regression method is known to be efficient but is nonrobust to the misspecification of the regression function. In this article, we propose a novel way of optimally combining the propensity score function and the regression model. The resulting estimating equation enjoys the properties of robustness against misspecification of either the propensity score or the regression function, as well as being locally semiparametric efficient. We demonstrate analytically situations where our method leads to a more efficient estimator than some of its competitors. In a simulation study, we show the new method compares favorably with its competitors in finite samples. Supplementary materials for this article are available online.     

Infant‐directed speech to infants at risk for dyslexia: A novel cross‐dyad design

When mothers speak to infants at risk for developmental dyslexia, they do not hyperarticulate vowels in their infant‐directed speech (IDS). Here, we used an innovative cross‐dyad design to investigate whether the absence of vowel hyperarticulation in IDS to at‐risk infants is a product of maternal infant‐directed behavior or of infants’ parent‐directed cues. Interactions between mothers and infants who were at risk or not at risk for dyslexia were recorded in three conditions: when mothers interacted with (a) their own infants, (b) infants who were not their own but of the same risk status, and (c) infants who were not their own and of the opposite risk status. This design revealed both infant and parent effects. Mothers of not‐at‐risk infants hyperarticulated vowels significantly more when speaking to not‐at‐risk than to at‐risk infants. In contrast, mothers of at‐risk infants hyperarticulated vowels significantly less than NAR mothers, and this was irrespective of infant status. Mothers of not‐at‐risk infants thus adjusted their IDS to the infant's risk status, while mothers of at‐risk infants did not. We suggest that IDS is determined reciprocally by characteristics of both partners in the dyad: Both infant and maternal factors are essential for the vowel hyperarticulation component of IDS.     

Prevention programmes for youth gambling: a review of the empirical evidence

This paper critically reviews the existing literature on the effectiveness of gambling prevention programmes for youth. Two categories of preventive strategies, all universal and most school-based, are presented: gambling-specific prevention programmes and gambling and related skills workshops. The age of the participants across the different studies varied from 9 to 20 years. Results show that programmes in both categories are generally effective in reducing misconceptions and increasing knowledge about gambling. However, a lack of long-term follow-ups and of behavioural measures makes it difficult to draw any clear conclusions about the effectiveness of such programmes. Recommendations are presented to improve the development and evaluation of future prevention programmes for youth gambling.     

The Inherently Contested Nature of Nongovernmental Accountability: The Case of HAP International

While the principled case for humanitarian accountability is relatively straightforward, the practice is demonstrably more complicated, necessitating constant negotiation among stakeholders. However, despite the wave of research into nongovernmental accountability, few empirical studies have grappled with the phenomenon’s inherently contested nature. This paper foregrounds tensions arising in the elaboration of nonprofit accountability. Its approach is informed by critical constructivist theory, an international relations approach attuned to social power, identity and exclusion, and conceptual contestation; its conclusions are supported by interview data with key stakeholders. Focusing on the Humanitarian Accountability Partnership (HAP) International, it finds that initial consensus on the desirability of beneficiary (downward) accountability quickly gave way to principled disagreements and operational difficulties. Specifically, the initiation stage of HAP was marked by two conflicts—a debate about enforcement and a turf war over control—culminating in rebranding and relocation. The implementation stage was characterized by tensions over certification and intra-organizational struggles over leadership. The contemporary practice of accountability is shown to be a contingent and contested social process, with humanitarian identity and practice ultimately at stake.