moving average
柯林斯词典
1. N (of a sequence of values) a derived sequence of the averages of successive subsequences of a given number of members, often used in time series to even out short-term fluctuations and make a trend clearer (一列值的)移动平均数[statistics]
the 3-term moving average of 4, 6, 8, 7, 9, 8 is 6, 7, 8
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