designing-experiments

Selects the appropriate quasi-experimental method (DiD, ITS, SC) based on data structure and research questions. Use when the user is unsure which method to apply.

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SKILL.md

Designing Experiments

Helps select the appropriate causal inference method.

Decision Framework

Control Group?
- Yes: Go to Step 2.
- No: Consider Interrupted Time Series (ITS).
Unit Structure?
- Single Treated Unit:
  - With multiple controls: Synthetic Control (SC).
  - No controls: ITS.
- Multiple Treated Units:
  - With control group: Difference-in-Differences (DiD).
Time Structure?
- Panel Data (Multiple units over time): Required for DiD and SC.
- Time Series (Single unit over time): Required for ITS.

Method Quick Reference

Difference-in-Differences (DiD): Compares trend changes between treated and control groups. Assumes Parallel Trends.
Interrupted Time Series (ITS): Analyzes trend/level change for a single unit after intervention. Assumes Trend Continuity.
Synthetic Control (SC): Constructs a synthetic counterfactual from weighted control units. Assumes Convex Hull (treated unit within range of controls).