题目
Many statistical problems arise when estimating relationships using regression analysis. Some of these problems are due to the assumptions behind the regression model. Which one of the following is NOT one of these problems?
选项
A.Stratification
B.Multicollinearity
C.Heteroscedasticity
D.Autocorrelation
答案
A
解析
Stratification is not related to regression analysis. Choices B, C, and D describe situations that can produce inaccurate descriptions of the relationship between the independent and dependent variables. Multicollinearity occurs when the independent variables are themselves correlated. Heteroscedasticity occurs when the variances are different across observations, and autocorrelation occurs when successive observations are influenced by the proceeding observations.分层与回归分析无关。 选项B，C和D描述了可能对自变量和因变量之间的关系产生不正确描述的情况。 当自变量自身相关时，会发生多重共线性。 当不同观测值之间的方差不同时会发生异方差，而当后续观测值受到进行中的观测值影响时会发生自相关。