arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.2855math.PRmath.STstat.TH
收藏

三参数二项式逼近

A Three-Parameter Binomial Approximation

Vydas Čekanavičius, Erol A. Peköz, Adrian Röllin, Michael Shwartz

摘要:

我们使用移位二项分布来近似独立但不一定相同分布的伯努利随机变量之和的分布,其中三个参数(试验次数,成功概率和移位量)被选择为匹配两个分布的前三个时刻。我们给出了一个界的近似误差的全变差度量使用斯坦的方法。数值研究讨论表明,移位二项式近似通常比泊松或标准二项式近似更准确。近似解决贝叶斯分层建模中出现的问题的应用进行了讨论。

英文摘要:

We approximate the distribution of the sum of independent but not necessarily identically distributed Bernoulli random variables using a shifted binomial distribution where the three parameters (the number of trials, the probability of success, and the shift amount) are chosen to match up the first three moments of the two distributions. We give a bound on the approximation error in terms of the total variation metric using Stein's method. A numerical study is discussed that shows shifted binomial approximations typically are more accurate than Poisson or standard binomial approximations. The application of the approximation to solving a problem arising in Bayesian hierarchical modeling is also discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑