stkcd month eventdate Rpt Rit
1 1-Feb-09 16-Jun-09 0.0240993 0.185567
1 1-Nov-09 16-Jun-09 -0.0071637 0.079181
1 1-Dec-09 16-Jun-09 0.0251675 0.004534
1 1-Aug-09 16-Jun-09 0.0294702 -0.305195
1 1-Apr-09 16-Jun-09 0.0294702 0.023839
1 1-Jan-09 16-Jun-09 0.0294702 0.230444
1 1-Jul-09 16-Jun-09 0.0294702 0.199817
1 1-Mar-09 16-Jun-09 0.0294702 0.155072
1 1-Jun-09 16-Jun-09 -0.0071637 0.223094
1 1-May-09 16-Jun-09 0.0294702 0.093137
1 1-Sep-09 16-Jun-09 0.0294702 0.100055
1 1-Oct-09 16-Jun-09 0.0294702 0.123438
我的数据是这样的,现在需要计算从并购日(eventdate)当天到并购日后24个月内的Rpt累乘值,month代表市场交易日,stata多期循环连乘命令该怎么写呢?
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