In the context of testing for a unit root in a univariate time series, the convention is to ignore information in related time series. This paper shows that this convention is quite costly, as large power gains can be achieved by including correlated stationary covariates in the regression...

This article reviews David Hendry's Econometrics: Alchemy or Science?

This paper tracks distributional changes over the last quarter of the twentieth century. We focus on three conceptually distinct distributions: the distribution of wages, the distribution of annual earnings and the distribution of total family income adjusted for family size. We show that all...