| 单词 | poisson distribution |
| 释义 | > as lemmasPoisson distribution Poisson distribution n. (also Poisson's distribution) [described by Poisson in Recherches sur la probabilité des jugements (1837)] a frequency distribution which gives the probability of a number of discrete events occurring in a certain time interval, or of a particular number of successes out of a given number of trials.In a Poisson distribution the probability of k events (or successes) occurring is given by the probability mass function λke−λ/k!, where λ is a positive parameter. The mean and variance of the function are both λ.This distribution applies to random events that are independent of one another, where the events are rare (or the probability of success is low), and where the average rate of occurrence does not change over time.extracted from Poissonn.adj.< as lemmas |
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