n and prediction.
* If your model is *correct,* they're the same thing!


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# The Data Generating Process

**Social science is harder.** People have free will!
* Inputs? Any outcome is determined by far more than 10 or even 100 inputs.
  - Many inputs are impossible to measure.
* Functional form? No universal laws guaranteeing they are simple.
  - Inputs often interact with each other.

Characterizing the full DGP for *anything* is typically far beyond the realm of possibility.

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