parameters: (self, ddof=1)
return_statement: return self.std(ddof=ddof) / np.sqrt(self.count())
docstring: Compute standard error of the mean of groups, excluding missing values.
  
          For multiple groupings, the result index will be a MultiIndex.
  
          Parameters
          ----------
          ddof : integer, default 1
              degrees of freedom
docstring_summary: Compute standard error of the mean of groups, excluding missing values.
docstring_tokens: Compute standard error of the mean of groups excluding missing values .
function: def sem(self, ddof=1):
          """
          Compute standard error of the mean of groups, excluding missing values.
  
          For multiple groupings, the result index will be a MultiIndex.
  
          Parameters
          ----------
          ddof : integer, default 1
              degrees of freedom
          """
  
          return self.std(ddof=ddof) / np.sqrt(self.count())
function_tokens: def sem ( self , ddof = 1 ) : return self . std ( ddof = ddof ) / np . sqrt ( self . count ( ) )