问题如下图:
选项:
A.
B.
C.
解释:
R²是不是又称multiple r²?
NO.PZ2018101001000037 问题如下 Whiof the following scriptions about multiple R-squareis most likely correct? A.R² is a reliable measure of the explanatory power of the multiple regression mol. B.R² almost always increases variables are aeto the mol. C.R² is always smaller ththe austeR² . B is correct.考点: R-squareanausteR-square解析: 对于多元回归来说,R²不是一个具有很强力度的可依赖的指标,所以A错误。R² 通常大于等于austeR²,所以C错误。B的描述是正确的,当自变量增加时,R²也会随着增加。 本题解析里说“对于多元回归来说,R²不是一个具有很强力度的可依赖的指标”,但不是说R²的值说明模型可以多大比例Y的变动吗,比如R²是90%,说明模型可以Y的90%的变动,那为什么又说R²不是一个具有很强力度的可依赖的指标呢?
NO.PZ2018101001000037 问题如下 Whiof the following scriptions about multiple R-squareis most likely correct? A.R² is a reliable measure of the explanatory power of the multiple regression mol. B.R² almost always increases variables are aeto the mol. C.R² is always smaller ththe austeR² . B is correct.考点: R-squareanausteR-square解析: 对于多元回归来说,R²不是一个具有很强力度的可依赖的指标,所以A错误。R² 通常大于等于austeR²,所以C错误。B的描述是正确的,当自变量增加时,R²也会随着增加。 另外,C为啥不对呢
请问A为什么不对?