Many studies estimate the impact of exposure to some quasiexperimental policy or event
using a panel event study design. These models, as a generalized extension of “difference-in-…

Twin births are often construed as a natural experiment in the social and natural sciences
on the premise that the occurrence of twins is quasi-random. We present population-level …

INTRODUCTION: This audit examines our total experience with penetrating thoracic trauma.
It reviews all the patients who were brought alive to our surgical service and all who were …

In this paper, we describe a computational implementation of the Synthetic difference-in-differences
(SDID) estimator of Arkhangelsky et al. (2021) for Stata. Synthetic difference-in-…

Background This prospective audit of appendicitis at a busy regional hospital reviews the
spectrum and outcome of acute appendicitis in rural and peri-urban South Africa. Method We …

In this article, we examine several techniques that allow for the construction of bounds estimates
based on instrumental variables, even when the instruments are not valid. We introduce …

I propose a method for difference-in-differences (DD) estimation in situations where the
stable unit treatment value assumption is violated locally. This is relevant for a wide variety of …

Trauma is a major burden of disease in lower- and middle-income countries, and to address
the causes and treatment requires specialist services and multidisciplinary care. Despite this…

Background Diaphragmatic injuries from penetrating thoracoabdominal trauma are notoriously
difficult to detect with clinical and radiological evaluation. The aim of this study was to …

Introduction The proportion of patients who die during or after surgery, otherwise known as
the perioperative mortality rate (POMR), is a credible indicator of the safety and quality of …