Table 2. Estimated benchmark dose (BMD) and benchmark dose lower limit (BMDL) for different binomial data sets, different models and different levels of BMR using PROAST, BMDS and bmd.
PROAST and BMDS uses profile likelihood intervals for estimating BMDL while the R package bmd uses the delta method, inverse regression or bootstrap. For all data sets the excess risk definition was used.
BMD | BMDL | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Data set | Modela | BMR | PROAST | BMDS | bmd | PROAST profile |
BMDS profile |
bmd delta |
bmd inverse |
bmd bootstrap |
||
A | Log–logistic | 0.05 | 0.044 | 0.044 | 0.044 | 0.022 | 0.022 | 0.020 | 0.029 | 0.027 | ||
0.1 | 0.063 | 0.062 | 0.062 | 0.036 | 0.036 | 0.036 | 0.043 | 0.042 | ||||
Log-normal | 0.05 | 0.047 | 0.047 | 0.047 | 0.026 | 0.026 | 0.025 | 0.033 | 0.030 | |||
0.1 | 0.063 | 0.063 | 0.063 | 0.038 | 0.038 | 0.038 | 0.045 | 0.043 | ||||
Weibull | 0.05 | 0.027 | 0.027 | 0.027 | 0.010 | 0.010 | 0.006 | 0.014 | 0.013 | |||
0.1 | 0.047 | 0.047 | 0.047 | 0.022 | 0.022 | 0.018 | 0.027 | 0.026 | ||||
B | Log–logistic | 0.05 | 0.087 | 0.087 | 0.087 | 0.063 | 0.063 | 0.064 | 0.071 | 0.072 | ||
0.1 | 0.102 | 0.102 | 0.102 | 0.079 | 0.079 | 0.080 | 0.085 | 0.086 | ||||
Log-normal | 0.05 | 0.089 | 0.089 | 0.089 | 0.066 | 0.066 | 0.066 | 0.074 | 0.075 | |||
0.1 | 0.102 | 0.102 | 0.102 | 0.079 | 0.079 | 0.080 | 0.085 | 0.087 | ||||
Weibull | 0.05 | 0.078 | 0.072 | 0.078 | 0.049 | 0.049 | 0.049 | 0.058 | 0.059 | |||
0.1 | 0.098 | 0.093 | 0.098 | 0.069 | 0.068 | 0.069 | 0.076 | 0.078 | ||||
C | Log–logistic | 0.05 | 0.055 | 0.55 | 0.055 | 0.032 | 0.031 | 0.029 | 0.037 | 0.035 | ||
0.1 | 0.081 | 0.081 | 0.081 | 0.052 | 0.052 | 0.050 | 0.058 | 0.056 | ||||
Log-normal | 0.05 | 0.058 | 0.058 | 0.058 | 0.036 | 0.036 | 0.034 | 0.041 | 0.039 | |||
0.1 | 0.080 | 0.080 | 0.080 | 0.053 | 0.053 | 0.052 | 0.058 | 0.057 | ||||
Weibull | 0.05 | 0.046 | 0.046 | 0.046 | 0.024 | 0.024 | 0.020 | 0.029 | 0.028 | |||
0.1 | 0.077 | 0.077 | 0.077 | 0.046 | 0.046 | 0.043 | 0.051 | 0.051 |
Notes.
All models fitted as unrestricted models in BMDS.