@Substitution(name='<STR_LIT>')<EOL><INDENT>@Appender(_common_see_also)<EOL>def std(self, ddof=<NUM_LIT:1>, *args, **kwargs):<DEDENT>
<EOL>nv.validate_groupby_func('<STR_LIT>', args, kwargs)<EOL>return np.sqrt(self.var(ddof=ddof, **kwargs))<EOL>
Compute standard deviation of groups, excluding missing values.

For multiple groupings, the result index will be a MultiIndex.

Parameters
----------
ddof : integer, default 1
    degrees of freedom