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Direct linkE. C. Hedberg; Larry V. Hedges – Evaluation Review, 2026
The difference in differences design is widely used to assess treatment effects in natural experiments or other situations where random assignment cannot, or is not, used (see, e.g., Angrist & Pischke, 2009). The researcher must make important decisions about which comparisons to make, the measurements to make, and perhaps the number of…
Descriptors: Statistical Analysis, Computation, Effect Size, Quasiexperimental Design
