它通常无关紧要,至少在实际应用中,因为每月计算我们通常会在月底结束时关闭。请参阅MSFT案例:
MSFT.Adjusted Return
2014-12-31 45.82396 NA
2015-01-31 39.85550 -0.13024755
2015-02-28 43.56686 0.09312032
2015-03-31 40.39746 -0.07274798
2015-04-30 48.32593 0.19626168
2015-05-31 46.86000 -0.03033425
RJan=39.8555045.82396−1
RFeb=43.5668639.85550−1