正常值范围的制订方法(二)

<正> 偏态分布资料的正常值范围估计在非正态分布的医学资料中,不少资料呈正偏态,也有的资料为负偏态,若资料的频数分布类型为正偏态(所谓正偏态,印变量值较大的数据一侧尾部较长,资料多集中在变量值小的一侧)常用对数正态法。

The Method of Establishing Normal Range

To determine normal range is, generally, based on the types of distribution. Mean plus or minus two time standard deviation ((?)±2S), this range is usually used as the normal range of normal distribution.If the data of the observed sample, however, is abnormality,the method of the logarithmic transformation of the data has to be used for the positive bias distribution. When the data, extremely bias, such as basophil leucocytes percentages, are goodness of fitting of poisson distribution, the determining of normal range should be based on poisson distribution.In any case, the distribution is known or unknown, We may use the percentile method to establish their normal range.This article has been described whether the distribution of the observed data is normality and how to establish the normal range from both health and disease populations.