Recent results for case-control sampling suggest when the covariate distribution is constrained by gene-environment independence, semiparametric estimation exploiting such independence yields a great deal of efficiency gain. We consider the efficient estimation of the treatment-biomarker...

Computer and Internet use, especially in developing countries, hasexpanded rapidly in recent years. Even in light of this expansion intechnology adoption rates, penetration rates differ markedly betweendeveloped and developing countries and across developing countries. Toidentify the...

The unbiasedness hypothesis - the joint hypothesis of uncovered interest parity (UIP) and rational expectations - has been almost universally rejected in studies of exchange rate movements. In contrast to previous studies, which have used short-horizon data, we test this hypothesis using...

To identify the determinants of cross-country disparities in personal computer and Internet penetration, we examine a panel of 161 countries over the 1999-2001 period. Our candidate variables include economic variables (income per capita, years of schooling, illiteracy, trade openness),...