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External Validity

External Validity. The External Validity Question. Theory. What you think. Cause construct. Effect construct. Cause-effect construct. Program. Observations. Program. Observations. Program-outcome relationship. Program-outcome relationship. What you do. What you see.

georgeaharris
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External Validity

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  1. External Validity

  2. The External Validity Question Theory What you think Cause construct Effect construct Cause-effect construct

  3. Program Observations Program Observations Program-outcome relationship Program-outcome relationship What you do What you see What you do What you see Observation Observation Program Observations Program Observations program-outcome relationship Program-outcome relationship What you do What you see What you do What you see Observation Observation The External Validity Question Theory Can we generalize to other persons, places, OR times? Cause construct Effect construct Cause-effect construct

  4. How Do We Generalize?Model I: Sampling Specified persons, places, and times Population

  5. How Do We Generalize?Model I: Sampling Population Draw sample Sample Draw sample

  6. How Do We Generalize?Model I: Sampling GeneraLize back Generalize back Population Sample

  7. How Do We Generalize?Model II: Proximal Similarity Our Study

  8. How Do We Generalize?Model II: Proximal Similarity Settings Our Study Times People Places

  9. How Do We Generalize?Model II: Proximal Similarity Less similar Settings Our Study Less similar Less similar Times People Places Less similar

  10. How Do We Generalize?Model II: Proximal Similarity Less similar Settings Our Study Less similar Less similar Times People Places Gradients of similarity Less similar

  11. Threats to External Validity Maybe it is just these people. Maybe it is just these places. Maybe it is just these times. Interaction of selection and treatment Interaction of setting and treatment Interaction of history and treatment

  12. How Can We Improve External Validity?

  13. Population Sample How Can We Improve External Validity? Random sampling

  14. Population Sample Our Study Places Times People How Can We Improve External Validity? Random sampling Replicate, Replicate, Replicate

  15. Population Sample Our Study Places Times People settings Our Study times people places How Can We Improve External Validity? Random Sampling Replicate, Replicate, Replicate Use theory

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