Difference in Differences Method

Methodology

The Difference in Differences (DiD) method is a quasi-experimental statistical technique designed to estimate the causal impact of an intervention. It compares the change in an outcome variable for a treatment group before and after an event to the change in the same variable for a control group over the same period. This robust approach helps isolate the specific effect of the intervention from other confounding temporal trends. It is widely used when true randomization is impractical.