如何判断相关系数是0.6，而非-0.6？4个x中，系数是有正有负的呀
问题如下图：
选项：
A. 
B. 
C. 
解释：
NO.PZ2015120204000016 问题如下 SelecteANOVA Results for Hansen’s RegressionThe most appropriate interpretation of the multiple R-squarefor Hansen’s mol is that: A.unexplainevariation in the pennt variable is 36 percent of totvariation. B.correlation between precteanactuvalues of the pennt variable is 0.36. C.correlation between precteanactuvalues of the pennt variable is 0.60. C is correct.The multiple R-squarefor the regression is 0.36; thus, the mol explains 36 percent of the variation in the pennt variable. The correlation between the precteanactuvalues of the pennt variable is the square root of the R-squareor0.36\sqrt{0.36}0.36= 0.60. rt
NO.PZ2015120204000016 问题如下 SelecteANOVA Results for Hansen’s RegressionThe most appropriate interpretation of the multiple R-squarefor Hansen’s mol is that: A.unexplainevariation in the pennt variable is 36 percent of totvariation. B.correlation between precteanactuvalues of the pennt variable is 0.36. C.correlation between precteanactuvalues of the pennt variable is 0.60. C is correct.The multiple R-squarefor the regression is 0.36; thus, the mol explains 36 percent of the variation in the pennt variable. The correlation between the precteanactuvalues of the pennt variable is the square root of the R-squareor0.36\sqrt{0.36}0.36= 0.60. 不明白这个correlation 就是 R-square 开平方 的结论是哪儿来的。
NO.PZ2015120204000016 问题如下 SelecteANOVA Results for Hansen’s RegressionThe most appropriate interpretation of the multiple R-squarefor Hansen’s mol is that: A.unexplainevariation in the pennt variable is 36 percent of totvariation. B.correlation between precteanactuvalues of the pennt variable is 0.36. C.correlation between precteanactuvalues of the pennt variable is 0.60. C is correct.The multiple R-squarefor the regression is 0.36; thus, the mol explains 36 percent of the variation in the pennt variable. The correlation between the precteanactuvalues of the pennt variable is the square root of the R-squareor0.36\sqrt{0.36}0.36= 0.60. 老师您好，请问下相关系数是R square的开根号不是应该是一元的方程才成立吗？本题是多元方程，为什么C也可以？
NO.PZ2015120204000016问题如下SelecteANOVA Results for Hansen’s RegressionThe most appropriate interpretation of the multiple R-squarefor Hansen’s mol is that:A.unexplainevariation in the pennt variable is 36 percent of totvariation.B.correlation between precteanactuvalues of the pennt variable is 0.36.C.correlation between precteanactuvalues of the pennt variable is 0.60.C is correct.The multiple R-squarefor the regression is 0.36; thus, the mol explains 36 percent of the variation in the pennt variable. The correlation between the precteanactuvalues of the pennt variable is the square root of the R-squareor0.36\sqrt{0.36}0.36= 0.60.R方不是X与Y之间的关系吗，为什么是actuY和precteY直接的关系
NO.PZ2015120204000016 问题如下 SelecteANOVA Results for Hansen’s RegressionThe most appropriate interpretation of the multiple R-squarefor Hansen’s mol is that: A.unexplainevariation in the pennt variable is 36 percent of totvariation. B.correlation between precteanactuvalues of the pennt variable is 0.36. C.correlation between precteanactuvalues of the pennt variable is 0.60. C is correct.The multiple R-squarefor the regression is 0.36; thus, the mol explains 36 percent of the variation in the pennt variable. The correlation between the precteanactuvalues of the pennt variable is the square root of the R-squareor0.36\sqrt{0.36}0.36= 0.60. 讲义中的R-square此处的multiple R-square相等的吗？那么为什么讲义上说R2 of 0.9 incates ththe mol，a whole，explains 90% of the variation in the pennt variable，此处multiple R-square0.36，指的不就是整个方程可以36%的Y吗？但A不是说的是未被的占36%？非常疑惑。虽然错误的选择了B，看了之后理解B错在是说correlation，但不明白A为什么是对的。
