NO.PZ2020010801000032
问题如下:
The sample mean is an OLS estimator of the model . What does the BLUE property imply about the mean estimator?
选项:
解释:
The sample mean estimator is the BLUE because it is a special case of OLS if the data are homoscedastic.
这个道题是不是意味着y 和x 没有线性关系,那怎么用OLS求mean estimator呢?