采用偏相关检验、逐步回归的方法，实证检验了中国股票发行市场的价值低估现象。
This paper tests the underpricing of IPOs of a share market based on the research methods developed from the Western empirical studies and combined with the environment of Chinese stock market.
并用双重筛选逐步回归的方法分析了环境(气候和土壤)因子与植物群落生活型谱梯度的关系，建立了相应的数学模型。
The relationship between environmental factors (climate and soil) and plant life form gradient was analysed by doub sieving progressive regression method, and mathematical models were set up.
在对影响武汉市年度保险费收入的基本变量进行分析的基础上，用逐步回归的方法建立数学模型，给出了预测武汉市年度保险费收入的一种方法。
In this paper, the basic variables related to the annual insurance income in Wuhan City are analysed and a model is constructed to forecast its annual insurance income by means of step regression.
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