Through designs akin to difference-in-differences, Bleakley (2007) produces evidence that the cam- paign to eradicate hookworm from the American South circa 1910 boosted school enrollment in childhood and income in adulthood. This comment works to replicate and reanalyze that study. Innovations...

The wild bootstrap was originally developed for regression models with heteroskedasticity of unknown form. Over the past thirty years, it has been extended to models estimated by instrumental variables and maximum likelihood, and to ones where the error terms are (perhaps multi-way) clustered....

Roodman (Stata Journal, 2011) introduced the program cmp for using maximum likelihood to fit multiequation combinations of Gaussian-based models such as tobit, probit, ordered probit, multinomial probit, interval censoring, and continuous linear. This presentation describes substantial...

A challenge in the development of aggregate indexes of trade protection is weighting individual tariffs in ways that (a) reflect their importance and (b) are not endogenous to the protection being measured. The most obvious basis for weights is actual imports; but these may be highly endogenous....

The most-noted studies on the impact of microcredit on households are based on a survey fielded in Bangladesh in the 1990s. Contradictions among them have produced lasting controversy and confusion. Pitt and Khandker (PK, 1998) apply a quasi-experimental design to 1991–92 data; they conclude...

At the heart of many econometric models is a linear function and a normal error. Examples include the classical small-sample linear regression model and the probit, ordered probit, multinomial probit, Tobit, interval regression, and truncateddistribution regression models. Because the normal...

At the heart of many econometric models are a linear function and a normal error. Examples include the classical small-sample linear regression model and the probit, ordered probit, multinomial probit, tobit, interval regression, and truncated-distribution regression models. Because the normal...

The Commitment to Development Index (CDI) ranks 22 of the world’s richest countries on their dedication to policies that benefit the five billion people living in poorer nations. Moving beyond standard comparisons of foreign aid volumes, the CDI quantifies a range of rich country policies...