NO.PZ2022062760000028
问题如下：
A market risk manager would like to analyze and forecast a security performance and has obtained the historical time series for that security. The manager consults a colleague from the quantitative analytic team who provides the following Partial Autocorrelation Function (PACF) plot:
Based on the plot above, which of the following is the best regression approach for the security?
选项：
A.
AR(1)
B.
MA(1)
C.
AR(2)
D.
MA(2)
解释：
中文解析：
PACF 在第二个延迟后中断。 此行为表示 AR(2) 过程。
The PACF cuts off after the second lag. This behavior indicates an AR(2) process.
求解为什么中断就是ar2？
