Rolling and Expanding in Python
From the Pandas cheat sheet · Windows and Time Series · verified Aug 2026
Rolling and Expanding
Calculate statistics across moving or cumulative windows.
python
df["moving_avg"] = df["value"].rolling(7, min_periods=1).mean()📌 Sort time data before window operations
💡 Offset windows handle uneven timestamps
🔍 expanding uses all observations to date
🎯 Set min_periods for early-window behavior
rollingwindowtime-series
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