Introduction: what is difference-in-differences? Difference-in-differences (DID) is a quasi-experimental method used to estimate causal effects when randomised controlled trials (RCTs) are not ...

Existing narratives around race and ethnicity in medicine are overwhelmingly negative. Historians have documented overt bias ...

On August 13, 2026, JAMA published a methodological guidance piece titled “Causal Language for Studies Using Difference-in-Differences Analyses,” addressed to the clinical research community at large.

Background Difference-in-differences is a method commonly used in population health research. It is based on assumptions that are well-known and well-understood in the classic textbook example of two ...

The phrase “correlation does not imply causation” is a fundamental rule in science, statistics, and logic. While the two concepts are often confused, they mean very different things. Understanding ...

Historical data indicate men develop coronary heart disease (CHD) 10 years before women. However, whether this sex gap persists in a contemporary sample amid changing cardiometabolic risk profiles, ...

Read this before returning to the grocery store. Andee Gosnell is a San Francisco born, Birmingham-based food photographer, writer, and recipe developer with five years experience who loves cooking ...

Econometrics, the application of statistical methods to economic data, can be instrumental in the identification of anticompetitive behavior by assisting in analyses including the assessment of market ...

A new study shows that how and where your blood pressure (BP) is measured can make a big difference in the results. The review, published in the Annals of Internal Medicine, found that readings taken ...

A new analysis of studies spanning the last century finds that differences in schooling appear to explain a large portion of the IQ gap between identical twins who were raised in separate homes. The ...

Over five percent of children and adolescents are diagnosed with attention deficit/hyperactivity disorder (ADHD) globally. This condition is characterized by a short attention span, hyperactivity or ...