术语“正态近似”的详细信息

英译术语:

normal approximation

汉语语境:

广义卡方型混合分布在许多非参数检验问题中有着广泛运用。通常采用正态分布近似这类分布，但是在非大样本的情况下，正态近似的效果并不理想。运用鞍点逼近技术近似广义卡方型混合随机变量的密度函数和分布函数，并且与正态近似方法以及卡方近似方法进行了比较。模拟表明鞍点逼近效果要优于其余两种方法，特别是密度函数尾部区域。

英语语境:

Random variables of general chi-squred-type mixed distribution is often used in nonparametric testing procedure. Its normal approximation performs not well in small or moderate sample size situations. We take the saddlepoint approximation approach, which outperforms the normal and chi-squared approximations, especially in the tail areas of the distribution.