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BACKGROUND We assessed aspects of Seguro Popular, a programme aimed to deliver health insurance, regular and preventive medical care, medicines, and health facilities to 50 million uninsured Mexicans. METHODS We randomly assigned treatment within 74 matched pairs of health clusters-ie, health facility catchment areas-representing 118 569 households in(More)
The effect of financial incentives on Rey AVLT recognition memory performance was assessed. Clinically referred mild head trauma (MHT) patients with financial incentives were compared to patients with neurologically documented brain dysfunction who did not have financial incentives. The MHT group was subdivided into a group with strong performance on a(More)
We develop an approach to conducting large-scale randomized public policy experiments intended to be more robust to the political interventions that have ruined some or all parts of many similar previous efforts. Our proposed design is insulated from selection bias in some circumstances even if we lose observations; our inferences can still be unbiased even(More)
7 Conestadistica 2 Abstract Background In what may be the largest randomized health policy experiment to date, we evaluate aspects of Seguro Popular, a program to deliver health insurance, regular and preventive medical care, pharmaceuticals, and health facilities to 50 million uninsured Mexicans. Methods We randomized treatment within 74 matched pairs of "(More)
Ecological inference (ei) takes contingency tables as the unit of analysis. These tables are described by marginal row and column totals (or proportions); the goal of inference is to determine the joint intra-table relationship between the rows and columns. Using a common example from political science, let the unit of analysis be a voting precinct in a(More)
Which should be preferred in a federal system, state-or national-level policymaking? Though theory suggests that more voters are satisfied by local control, we identify new conditions under which national policymaking is preferred based solely on the distorting influence of interest groups. Even when interest groups capture state policymaking at the same(More)
Description Blocks units into experimental blocks, with one unit per treatment condition, by creating a measure of multivariate distance between all possible pairs of units. Maximum, minimum, or an allowable range of differences between units on one variable can be set. Randomly assign units to treatment conditions. Diagnose potential interference between(More)