ml-recall

#rolling-statistics

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mediumAI-checkedTime Series

y is a pandas Series of daily sales indexed by date. You want a feature for day $t$ equal to the mean of the 7 days before $t$ , with no lookahead leakage. Which expression computes it?

y.shift(1).rolling(7).mean()1
y.rolling(7).mean()2
y.shift(1).rolling(7, center=True).mean()3
y.rolling(7, center=True).mean().shift(1)4

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