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对于不含常数项的多元线性回归，如何求其相关系数？。
理论上来说R方不应该出现负数，R方是这样求出来的：SSR=sum((yi估计-y均值)^2); SST=sum((yi-y均值)^2)；R^2=SSR/SST;但是regress中为什么会出现负值我也不知道，因为我没有看过源程序。但是，判断拟合优度也不一...
3 years ago | 0
| accepted
