NO.PZ202106160300003901
问题如下：
An analyst is examining the annual growth of the money supply for a country over the past 30 years. This country experienced a central bank policy shift 15 years ago, which altered the approach to the management of the money supply. The analyst estimated a model using the annual growth rate in the money supply regressed on the variable (SHIFT) that takes on a value of O before the policy shift and 1 after. She estimated the following:
Critical t-values, level of significance of 0.05:
One-sided, left side: -1.701
One-sided, right side: ±1.701
Two-sided: ±2.048
The variable SHIFT is best described as:
选项：
A. an indicator variable
B. a dependent variable
C. a continuous variable
解释：
A is correct. SHIFT is an indicator or dummy variable because it takes on only the values 0 and 1.
这个能说明下什么意思嘛，在哪个知识点呢
