std(self, axis=None, dtype=None, out=None, ddof: 'int' = 1, keepdims: 'bool' = False, skipna: 'bool' = True)
Normalized by N-1 by default. This can be changed using the ddof argument
Axis for the function to be applied on.
Degrees of Freedom. The divisor used in calculations is N - ddof, where N represents the number of elements.
Exclude NA/null values. If an entire row/column is NA, the result will be NA.
Return sample standard deviation over requested axis.
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