This paper studies productivity and preferences in scientific research. Collaboration is increasingly important for innovation in science, and other domains, but we have limited understanding of the factors researchers use to choose their collaborators and the projects they work on. Here, we use...

This paper analyzes the relationship between postmarketing promotional activity and reporting of adverse drug reactions (ADRs) by modeling the interaction between a regulator (the FDA) and a pharmaceutical firm. Promotion-driven market expansions enhance profitability yet may involve the risk of...

We develop a flexible test for changes in the SES-mortality gradient over time that directly accounts for changes in the distribution of education, the most commonly used marker of SES. We implement the test for the period between 1984 and 2006 using microdata from the Census, CPS, and NHIS...

In the stochastic frontier model, we extend the multivariate probability statements of Horrace (J Econom, 126:335–354, <CitationRef CitationID="CR22">2005</CitationRef>) to calculate the conditional probability that a firm is any particular efficiency rank in the sample. From this, we construct the conditional expected efficiency rank...</citationref>

Abstract We introduce a notion of median uncorrelation that is a natural extension of mean (linear) uncorrelation. A scalar random variable Y is median uncorrelated with a k-dimensional random vector X if and only if the slope from an LAD regression of Y on X is zero. Using this simple...

We explore inference on regression coefficients in semiparametric multinomial response models. We consider cross-sectional, and both static and dynamic panel settings where we focus throughout on inference under sufficient conditions for point identification. The approach to identification uses...