When using a a flow with 'probability', insertion follows a binomial
distribution. Your example should be a good fit to a poisson distribution.
See here, for rules of thumb on approximation:
https://en.wikipedia.org/wiki/Binomial_distribution#Poisson_approximation
Note that you cannot not set 'end' and 'number' at the same time when using
'probability'. Either you set a fixed number of random trials ('end') or
you let the flow run until it has emitted a fixed number of vehicles
('number').
Am Mo., 7. März 2022 um 16:35 Uhr schrieb Yajun She <[email protected]>:
> Dear all,
>
> How to model a flow that a vehicle will be emitted following a Poisson
> distribution, and at the same time with a given traffic volume?
>
> For example, I tried to use attributes of "probability" and "number":
> <routes>
> <vType id="normal_car" vClass="passenger" departspeed="13.89"
> maxSpeed="13.89" />
>
> <flow id="upflow" type="normal_car" begin="0" end="5000"
> probability="0.01" number="1200" from="downin" to="upout" departPos="last"/>
> </routes>
>
> I am not sure the range of probability that will lead the vehicles to
> follow a Poisson distribution?
>
> Thanks,
> Yajun
>
>
>
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