Duflo (2001) exploits a 1970s schooling expansion in Indonesia to estimate the returns to schooling. Under the study's difference-in-differences (DID) design, two patterns in the data-shallower pay scales for younger workers and negative selection in treatment-can violate the parallel trends...

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...

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...

We replicate and reanalyse the most influential study of microcredit impacts (M. M. Pitt & S. R. Khandker's, 'The impact of group-based credit on poor households in Bangladesh: Does the gender of participants matter?', published in the Journal of Political Economy, 106, 1998). That study was...

In recent years, the interdisciplinary nature of global health has blurred the lines between medicine and social science. As medical journals publish non-experimental research articles on social policies or macro-level interventions, controversies have arisen when social scientists have...

We replicate and reanalyse the most influential study of microcredit impacts (Pitt and Khandker, 1998). That study was celebrated for showing that microcredit reduces poverty, a much hoped-for possibility (though one not confirmed by recent randomized controlled trials). We show that the...