据了解，全国1%人口抽样调查是以户为单位进行的，调查对象为我国境内抽中住户的全部人口。根据推算精度要求，采用多阶段、分层、概率比例的抽样方法，在全国共抽取约500万户、1400万人，抽样比例为全国人口的百分之一。

Key Points The X-bar is the sample mean of a given data set. It is one of the basic measures of statistical analysis.

We study here a Gaussian Mixture Model (GMM) with rare events data. In this case, the commonly used Expectation-Maximization (EM) algorithm exhibits extremely slow numerical convergence rate. To theor ...

据了解，全国1%人口抽样调查是以户为单位进行的，调查对象为我国境内抽中住户的全部人口。根据推算精度要求，采用多阶段、分层、概率比例的抽样方法，在全国共抽取约500万户、1400万人，抽样比例为全国人口的百分之一。

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