Table C.9.
Model | Number of parameters | Log‐likelihood | AIC | BMD | BMDL | BMDU | Converged | Accepted AIC |
---|---|---|---|---|---|---|---|---|
Null | 1 | −279.17 | 560.34 | NA | NA | NA | Yes | |
Full | 7 | −166.62 | 347.24 | NA | NA | NA | Yes | |
Logistic | 2 | −168.70 | 341.40 | 2.00 | 1.73 | 2.30 | Yes | Yes |
Probit | 2 | −168.44 | 340.88 | 1.83 | 1.61 | 2.09 | Yes | Yes |
Log‐logistic | 3 | −169.19 | 344.38 | 3.42 | 2.45 | 4.75 | Yes | No |
Log‐probit | 3 | −168.54 | 343.08 | 3.41 | 2.50 | 4.46 | Yes | No |
Weibull | 3 | −167.20 | 340.40 | 3.02 | 2.08 | 4.20 | Yes | Yes |
Gamma | 3 | −167.79 | 341.58 | 3.22 | 2.23 | 4.32 | Yes | Yes |
Two‐stage | 3 | −167.81 | 341.62 | 2.39 | 2.16 | 2.66 | Yes | Yes |
AIC: Akaike information criterion; BMD: benchmark dose; BMDL: benchmark dose lower confidence limit; BMDU: benchmark dose upper confidence limit.