Item | Category | Number of studies | % |
---|---|---|---|
Level coding discussed | Yes | 21 | 61.8% |
No | 13 | 38.2% | |
Goodness of fit considered | Yes | 20 | 58.8% |
No | 8 | 23.5% | |
Unclear or not reported | 6 | 17.6% | |
Internal or external validity investigated | Yes | 10 | 29.4% |
No | 5 | 14.7% | |
Unclear or not reported | 19 | 55.9% | |
Estimation model | Conditional or multinomial logit | 13 | 38.2% |
Random effects probit | 3 | 8.8% | |
Latent-class analysis | 2 | 5.9% | |
Mixed logit | 15 | 44.1% | |
Random effects conditional logit | 2 | 5.9% | |
Other | 2 | 5.9% | |
Unclear or not reported | 2 | 5.9% | |
Removed responses | Reasons for removal reported | 6 | 17.6% |
Unclear or not reported | 28 | 82.4% | |
Model | Akaike information criteria | 3 | 8.8% |
Bayesian information criteria | 4 | 11.8% | |
Likelihood ratio test | 11 | 32.4% | |
Pseudo Rsquared | 1 | 2.9% | |
Other | 2 | 5.9% | |
Not reported | 16 | 47.1% |