The vehicles generator is one of the fundamental models of traffic simulation system and it provides traffic flow distribution over a period , including poisson distribution , binomial distribution , negative binomial distribution , etc 摘要车流发生器是交通模拟系统的基本模型之一,用于解决交通流的输入问题。
Through a probability problem , a connection is showed between binomial distribution and negative binomial distribution and therefore a composed formula is set up , which is proved by way of probability and algebra 摘要通过一个概率问题,给出二项分布与负二项分布的一种联系,从而建立一个组合公式,并由概率思维方式与代数方式给出证明。