回归分析是处理两个及两个以上变量间线性依存关系的统计方法。在医学领域中，此类问题很普遍，如人头发中某种金属元素的含量与血液中该元素的含量有关系，人的体表面积与身高、体重有关系；等等。回归分析就是用于说明这种依存变化的数学关系。-Regression analysis is to deal with two or more variables between the linear dependence of statistical methods. In the medical field, such problems are common, such as human hair in a metal content and the content of blood in the elemental relationship between the human body surface area and height, weight, and so on. Regression analysis is used to explain the dependence of the mathematical relationship.