NO.PZ202306130100003002
问题如下：
The interpretation of the intercept is the mean of the annual growth rate of the
money supply:
选项：
A.before the shift in policy.
over the entire period.
after the shift in policy.
解释：
A is correct. In a simple regression with a single indicator variable, the intercept
is the mean of the dependent variable when the indicator variable takes on a
value of zero, which is before the shift in policy in this case.
我看解析的意思是，如果一个regression model中含有一个指标性的变量，如shift，那么计算slope的时候，默认shift就是0吗？
