Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Model comparison and relative fit.
| Log-likelihood | AIC | BIC | d.f. | Item Response Parameter Restrictions | |
|---|---|---|---|---|---|
| 2 status | −3316.90 | 2149.72 | 2463.09 | 1048526 | Free |
| 3 status | −3135.86 | 1959.63 | 2337.63 | 1048489 | Free |
| 4 status | −3002.43 | 1782.79 | 2358.57 | 1048444 | Free |
| 5 status | −2953.56 | 1791.04 | 2599.77 | 1048391 | Free |
| 6 status | −2925.19 | 1856.31 | 2933.15 | 1048330 | Free |
| 4 status | −3028.09 | 1706.10 | 2000.58 | 1048508 | Fixed |
