统计系综(Statistical Ensemble) 为便于讨论和计算统计平均， Gibbs 首先引入统计系综的概念 统计平均是对一个系统所有可能出现的微观态按其 权重进行平均。
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用统计的方法去研究物体的宏观性质，常引入统计系综。
The statistical ensemble is usually introduced when the macroscopic nature of body are researched in statistical method.
在量子统计中，对统计系综引入了密度算符，力学量的平均值可以利用密度算符求出。
In the quantum statistical theory, the density operator is introduced in the statistical system. The expectation value of an obeservable can be obtained by the use of the density operator.
利用动态方程研究了偏振模色散矢量的统计特性，分别用统计系综和频率系综两种方法进行数值模拟。
Statistical characteristics of polarization mode dispersion (PMD) are investigated with dynamical equation. Simulations are performed in two methods: statistical ensemble and frequency ensemble.
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