1. KNR295 Sampling Slide 1 Sampling & External Validity Chapter 2

2. KNR 295: Sampling Slide 2 External Validity: Critiquing  The sampling model…

3. KNR 295: Sampling Slide 3 External Validity: Critiquing  The sampling model…  Goal (claim) is representative sampling  Often not attainable -  Who to generalize to?  Availability of the true “representative” sample?  Will the sample be representative of other times?  An alternative is to model (or critique) the differences in a systematic way…

4. KNR 295: Sampling Slide 4 External Validity: Critiquing  Proximal similarity model (Campbell, 1963)

5. KNR 295: Sampling Slide 5 External Validity: Critiquing  Proximal similarity model (Campbell, 1963)  The idea here is to quantify the difference between the various properties of the study you are considering, and that to which you want to generalize, and then consider the likelihood that this difference would alter the research’s findings

6. KNR 295: Sampling Slide 6 External Validity: Critiquing  What to do?  Evaluate, critique, consider…  And if that fails, replicate

7. KNR 295: Sampling Slide 7 Sampling Terminology