文件名称：Correlation
文件大小：166KB
文件格式：PDF
更新时间：2014-12-23 02:38:25
统计
统计资料 Correlation and regression are statistical methods that are commonly used in the medical literature to compare two or more variables. Although frequently confused, they are quite different. Correlation measures the association between two variables and quantitates the strength of their relationship. Correlation evaluates only the existing data. Regression uses the existing data to define a mathematical equation which can be used to predict the value of one variable based on the value of one or more other variables and can therefore be used to extrapolate between the existing data. The regression equation can therefore be used to predict the outcome of observations not previously seen or tested.