Za/2 | Type I error | 1.96 |
ZB | Type II error | 0.84 |
λ 0 | Estimated change in the accident rate per 1000 minibuses over the 14-month period in the control arm | −0.01 |
Absolute difference | .01 | |
λ 1 | Estimated change in the accident rate per 1000 minibuses over the 14-month period in the intervention arm | −0.02 |
y | Number of person years in each arm | 116 |
Number of cars assuming cars followed for 1.16 years or 14 months | 954 | |
Number of vehicles to follow with 10% buffer per arm | 1060 |