Table 2 Number of cases for each observation type, model type and experiment type across study types (N = 267)a
Study type | Observation type (Number of cases) | Experiment type (Number of cases) | Model type (Number of cases) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Survey | Interview | FGD | Survey-based choice experiment | Choice experiment | RCT | Economic experiment | Nudge/information intervention experiment | Simul-ation model | Optimi-sation model | Other model | |
Experiment (49 studies) | 6 | 7 | 7 | 9 | 20 | ||||||
Experiment and model (4 studies) | 2 | 2 | 4 | ||||||||
Model (41 studies) | 35 | 5 | 1 | ||||||||
Observation (7 studies) | 6 | 1 | 1 | ||||||||
Observation and experiment (165 studies) | 157 | 15 | 26 | 75 | 7 | 3 | 21 | 58 | |||
Observation and model (1 study) | 1 | 1 | 1 | ||||||||