sem(self, axis=None, skipna=True, level=None, ddof=1, numeric_only=None, **kwargs)
Normalized by N-1 by default. This can be changed using the ddof argument
Exclude NA/null values. If an entire row/column is NA, the result will be NA.
If the axis is a MultiIndex (hierarchical), count along a particular level, collapsing into a scalar.
Delta Degrees of Freedom. The divisor used in calculations is N - ddof, where N represents the number of elements.
Include only float, int, boolean columns. If None, will attempt to use everything, then use only numeric data. Not implemented for Series.
Return unbiased standard error of the mean over requested axis.
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