Midterm #2 & #3 - Quasi-Experimental Designs

Question 1

key characteristics

Answer 1

1. lack random assignment
2. control group (non-randomized)
3. confounding variables
4. comparative nature
5. adaptability and practicality

Question 2

time series

Answer 2

• sequence of data points, collected or recorded at consistent time intervals over a period of time

Question 3

interrupted time-series design

Answer 3

• measuring a variable at multiple time points, both before and after a significant intervention or event

Question 4

control group requirements in differences in differences

Answer 4

• parallel trends assumption
• similarity in baseline characteristics
• no spillover effect
• stable group composition
• comparable external factors

Question 5

strategies for improving validity

Answer 5

• using control groups (DID)
• matching techniques
• statistical controls

Question 6

exact matching

Answer 6

• groups matched on key covariates exactly
• can be highly effective but often results in a significant loss of data

Question 7

propensity score matching

Answer 7

• individuals matched on the probability of being assigned to the treatment group, given observed covariates