已知eventstudy2格式(部分参数)如下:
其中,
evwlb和evwub分别是事件窗口的上下界:
evwlb(event_window_lower_boundary) specifies the lower boundary of the event window, measured in trading days relative to the event date. The default value is -20.
而car1LB和car1UB分别是计算CAAR等指标的上下界
car1LB(CAR_window_1_lower_boundary) to car10LB(CAR_window_10_lower_boundary) specifies the lower boundary of the window over which cumulative (average) abnormal returns are to be calcuated.
我的问题是:
1. ‘
evwlb和evwub’ 与 ‘car1LB和car1UB’ 大小关系是什么,前者是否严格包含后者?
2. 在有 ‘car1LB和car1UB’ 的情况下,‘
evwlb和evwub’ 作用是什么?