To evaluate the success of a new product, managers need to determine how much of its new demand is due to cannibalizing the firm's other products, rather than drawing from competition or generating primary demand. We introduce a time-varying vector error-correction model to decompose the base...

Barbieri, Keshk, and Pollins (2009) introduce a new Correlates of War trade data set and express various opinions on issues related to analyzing data on trade and how these may impact our inferences on the relationship between trade and conflict. Since there are 33 references to my name in their...

The low unemployment rates traditionally enjoyed by Sweden have often been attributed to the country's extensive system of active labour market programmes, which have thus frequently been regarded as a model for other countries to emulate. However, unemployment grew enormously in Sweden when the...

Murrayand Tsiatis (1996) described a weighted survival estimate thatincorporates prognostic time-dependent covariate informationto increase the efficiency of estimation. We propose a test statisticbased on the statistic of Pepe and Fleming (1989, 1991) thatincorporates these weighted survival...

The theory of conditional copulas provides a means of constructing flexible multivariate density models, allowing for time varying conditional densities of each individual variable, and for time-varying conditional dependence between the variables. Further, the use of copulas in constructing...

This paper provides a framework for understanding trade patterns in the Mashreq. An augmented gravity model is used to compare actual with expected levels of trade. Trade barriers, political uncertainty, and over-appreciation of domestic currencies seem to explain low levels of international...

Some scholars have rushed to judgment about the nature of the relationship between trade and conflict, making strong assumptions about the data upon which their conclusions rest. In this paper, we test these assumptions, showing that they are often not warranted and, thus, pose threats to many...