Inference for Parameters Defined by Moment Inequalities: A Recommended Moment Selection Procedure

This paper is concerned with tests and confidence intervals for parameters that are not necessarily point identified and are defined by moment inequalities. In the literature, different test statistics, critical‐value methods, and implementation methods (i.e., the asymptotic distribution versus the bootstrap) have been proposed. In this paper, we compare these methods. We provide a recommended test statistic, moment selection critical value, and implementation method. We provide data‐dependent procedures for choosing the key moment selection tuning parameter κ and a size‐correction factor η.     

Knowledge transfer in MNCs: Examining how intrinsic motivations and knowledge sourcing impact individual centrality and performance

Studies investigating individual performance in knowledge-intensive work are finding that individual performance is a result, to some degree, of obtaining the right information to solve novel, challenging problems. Yet we know little about the role that the individual plays in the knowledge processes in multinationals and the relationship between individual knowledge sourcing activities and performance. Our expectation is that successful knowledge transfer will be based on an individual's intrinsic motivation, access to knowledge from explicit or tacit knowledge sources within and across firm boundaries, and position in the overall advice network of the multinational corporation. Using survey and social network data collected in one multinational consulting firm, we investigated the knowledge sourcing activities and informal advice networks for 1439 of the entire 1698 individuals in one multinational spread across 28 offices (84.7% response rate). Through hierarchical regression analysis we find that 1) intrinsic motivations are strongly related to creativity and efficiency and 2) MNCs should support individual level activities that include not only the use of internal knowledge sources but also the use of external knowledge sources. Research results also suggest that 3) there are different patterns of knowledge sourcing activities based on whether efficient or creative performance is the goal and 4) these differ significantly depending upon the functional group to which the individual belongs. Implications for theories of the knowledge-based view of the multinational corporation and practical implications for managers are discussed.     

Further Evidence on the Great Crash,the Oil-Price Shock,and the Unit-Root Hypothesis

Recently, Perron has carried out tests of the unit-root hypothesis against the alternative hypothesis of trend stationarity with a break in the trend occurring at the Great Crash of 1929 or at the 1973 oil-price shock. His analysis covers the Nelson–Plosser macroeconomic data series as well as a postwar quarterly real gross national product (GNP) series. His tests reject the unit-root null hypothesis for most of the series. This article takes issue with the assumption used by Perron that the Great Crash and the oil-price shock can be treated as exogenous events. A variation of Perron's test is considered in which the breakpoint is estimated rather than fixed. We argue that this test is more appropriate than Perron's because it circumvents the problem of data-mining. The asymptotic distribution of the estimated breakpoint test statistic is determined. The data series considered by Perron are reanalyzed using this test statistic. The empirical results make use of the asymptotics developed for the test statistic as well as extensive finite-sample corrections obtained by simulation. The effect on the empirical results of fat-tailed and temporally dependent innovations is investigated, in brief, by treating the breakpoint as endogenous, we find that there is less evidence against the unit-root hypothesis than Perron finds for many of the data series but stronger evidence against it for several of the series, including the Nelson-Plosser industrial-production, nominal-GNP, and real-GNP series.     

Higher‐Order Improvements of a Computationally Attractive k‐Step Bootstrap for Extremum Estimators

This paper establishes the higher‐order equivalence of the k‐step bootstrap, introduced recently by Davidson and MacKinnon (1999), and the standard bootstrap. The k‐step bootstrap is a very attractive alternative computationally to the standard bootstrap for statistics based on nonlinear extremum estimators, such as generalized method of moment and maximum likelihood estimators. The paper also extends results of Hall and Horowitz (1996) to provide new results regarding the higher‐order improvements of the standard bootstrap and the k‐step bootstrap for extremum estimators (compared to procedures based on first‐order asymptotics). The results of the paper apply to Newton‐Raphson (NR), default NR, line‐search NR, and Gauss‐Newton k‐step bootstrap procedures. The results apply to the nonparametric iid bootstrap and nonoverlapping and overlapping block bootstraps. The results cover symmetric and equal‐tailed two‐sided t tests and confidence intervals, one‐sided t tests and confidence intervals, Wald tests and confidence regions, and J tests of over‐identifying restrictions.     

Using satellite remote sensing and household survey data to assess human health and nutrition response to environmental change

Climate change and degradation of ecosystem services functioning may threaten the ability of current agricultural systems to keep up with demand for adequate and inexpensive food and for clean water, waste disposal and other broader ecosystem services. Human health is likely to be affected by changes occurring across multiple geographic and time scales. Impacts range from increasing transmissibility and the range of vectorborne diseases, such as malaria and yellow fever, to undermining nutrition through deleterious impacts on food production and concomitant increases in food prices. This paper uses case studies to describe methods that make use of satellite remote sensing and Demographic and Health Survey data to better understand individual-level human health and nutrition outcomes. By bringing these diverse datasets together, the connection between environmental change and human health outcomes can be described through new research and analysis.     

Tragic Narratives in Popular Culture: Depictions of Homicide in Rap Music1

Homicide is a rare event, but depictions of it are quite common in our culture and discourse. Commercially successful rappers have appropriated homicide as a central theme in their lyrical compositions. The tremendous success of rap music is indicative of its increasing popular appeal and cultural impact. We reveal the ways homicide is constructed within rap music and its frequency of occurrence across time. Employing a cultural criminology framework, we analyze the most popular rap songs over the period 1989–2000, as determined by Billboard music charts, for references to homicide. Using content analysis we explore the emergent themes associated with homicide scenarios in rap lyrics. Results show violent death was constructed in glorified ways, incorporated cautionary tales, or used as an analogy for powerful rhyming. The major themes found in these homicide‐related rap lyrics were the normalization of killing, respect maintenance, confrontation with the power structure, vengeance, and masculine confrontation. Gender patterns of killing were surprising and distinct. Homicide was almost always male on male. Careful consideration is given to the multiple meanings of homicide, particularly the ways rappers have appropriated the word “killing” and transformed it into a term that indicates creative success.     

Mass Media Campaign Impacts Influenza Vaccine Obtainment of University Students

Abstract

Objective: To describe the effectiveness of a mass media campaign in increasing the rate of college student influenza vaccine obtainment. Participants/Methods: Students (N = 721) at a large southern university completed a survey between September 2011 and January 2012 assessing what flu clinic media sources were visualized and if they encouraged them to obtain vaccination. Results: Nearly a 30% increase was seen in flu vaccination rates in Fall 2011 over Fall 2010. The main campus Web site portal was the most visualized media source among students. The majority of responses indicated that the source of information visualized had a moderate to strong influence over their decision to get vaccinated. Conclusions: Various communication channels should be utilized to increase influenza vaccination rate on a university campus. Use of mass media to influence college students to perceive, retain, and act on the message of obtaining the influenza vaccine did produce a noteworthy outcome.