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当然ドキュメントを真っ先に見ますよね。
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[https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.std.html](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.std.html)
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> Normalized by N-1 by default. This can be changed using the ddof argument
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[https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.std.html](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.std.html)
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> Normalized by N-1 by default. This can be changed using the ddof argument
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> ddof : int, default 1
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> Delta Degrees of Freedom. The divisor used in calculations is N - ddof, where N represents the number of elements.
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```
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