With the development of the computer technology and the improvement of the experiment technology, there often are the regression problems which include more independentvariablesin medical data.
随着电子计算技术的飞速发展和实验技术的不断提高，医学资料中经常出现包含较多自变量的大型回归问题。
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In practical work, it is frequent that there is power relation among independentvariables when the correlation between dependent variable and independent variables is explained by regression model.
However, when try to regressionindependentvariables to the dependent variables in multivariate analysis, the coefficients are all non-zero. So these models lack of interpretation.