Researcher knows what changed how much i dont know

Researcher knows: what changed, how much
i. Don’t know who or why
e. Cohort study: with people who share a similar event
i. Ex: birth, marriage, divorce
3. Panel study**
a. Measures the same population AND the same sample 3 times
b. Advantage: can identify who changed and hopefully why
c. Disadvantage: population is also changing across time
d. Researcher controls: subjects selected, timing of observations
e. Researcher knows: what changed, how much change, who
changed, why changed (sometimes)
f. Follow-up Study:
i. Time 1: gather records and data from records
ii. Time 2: take sample from people on records and collect new
data
iii. Repeat
g. If panel studies are so good, why doesn’t everyone use it?
i. Expensive
ii. Subject fatigue
iii. Panel attrition: losing people out of your panel (why?)
8. What is retrospective memory? What are the limitations of retrospective memory in
surveys? (lecture)
9. List and describe the three kinds of longitudinal research designs: classical experimental
Describe the two special types of trend and panel studies: cohort studies (p.36-37), follow-up
studies. Contrast and compare their strengths and weaknesses. (book and lecture)***
SEE #7
10. What is panel attrition? What are the six main sources of panel attrition? What is subject
fatigue? (p.35) (book and lecture)***

11. What is a Unit of Analysis? (p.37) Why is this choice important? What is the ecological
fallacy? (p.38) The reductionist fallacy? (p.40) (book and lecture)