We study how opinion leadership and social contagion within social networks affect the adoption of a new product. In contrast to earlier studies, we find evidence of contagion operating over network ties, even after controlling for marketing effort and arbitrary systemwide changes. More...

Building on the commentaries on our work, we make additional suggestions for future research on social contagion and new product diffusion. In particular, we note that social contagion may occur for many reasons and that investigating how various personal or group characteristics moderate the...

We show both analytically and through Monte Carlo simulations that applying standard hazard models to right-truncated data, i.e., data from which all right-censored observations are omitted, induces spurious positive duration dependence and hence can trick researchers into believing to have...

The fairness of the application of the death penalty has come under question in recent years, amid the growing number of minority death row inmates. In this study, the Supreme Court decision Ring v. Arizona, which changed the death penalty sentencing phase in 13 states, is used to identify the...

Employment growth could reduce violence during civil conflicts. To determine if increased employment affects violence we analyzed varying employment in development programs run by different US military divisions in Iraqi districts. Employment levels vary with funding periods and the military...