回归分析中关于调整r平方和r平方的关系Inaregressionanalysis,ifanewindependentvariableisaddedandR-squaredincreasesandadjustedR-squareddecreasesprecipitously,whatcanbeconcluded?在回归分析中,如果有一个新的

Question

回归分析中关于调整r平方和r平方的关系
In a regression analysis,if a new independent variable is added and R-squared increases and adjusted R-squared decreases precipitously,what can be concluded?
在回归分析中,如果有一个新的变量x加入,那么r的平方增大,同时调整r方减小,以下推论哪个是对的
The new independent variable improves the predictive power of the regression model.
新的变量改进了回归模型的预测能力
The new independent variable does not improve the predictive power of the regression model.
新的变量没有改进回归模型的预测能力
The regression was performed incorrectly.It is impossible for R-squared to increase and adjusted R-squared decrease simultaneously.
此回归不正确.因为不可能r平方增加但调整r平方减少

Answer 1

The new independent variable does not improve the predictive power of the regression model.
新的变量没有改进回归模型的预测能力