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在医学研究资料中,除正态分布外还有不少呈偏态分布。即频数分布的高峰位置不在中央,而是集中在观察值较大的一侧,小的一侧则拖着一条尾巴;或频数分布集中在观察值小的一侧,而大的一侧则拖着一条尾巴。此类资料分别称之为负偏态分布或正偏态分布。实践证明部分偏态资料可以通过观察值的对数变换
In medical research data, there are many skewed distributions in addition to the normal distribution. That is, the peak position of the frequency distribution is not in the center, but is concentrated on the side where the observation value is relatively large, and the small side is dragged with a tail; or the frequency distribution is concentrated on the side where the observation value is small, and the large side is dragged With a tail. Such data are called negative-skewed or positive-skewed distributions, respectively. Practice has proved that partial skewed data can be transformed by the logarithm of the observed values