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stochastic processes - Disalignment between global standard deviation and mean of rolling standard deviation - Quantitative Finance Stack Exchange
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BUG: Possible bug in rolling standard deviation calculation when using custom weights (pandas.core.window.rolling.Window.std) · Issue #53273 · pandas-dev/pandas · GitHub
BUG: Series rolling standard deviation gives zero for small numbers · Issue #40448 · pandas-dev/pandas · GitHub
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