parameters: (self)
docstring: Uncertainty on the mean value
docstring_summary: Uncertainty on the mean value
docstring_tokens: Uncertainty on the mean value
function: def uncertainty(self):
          """
          Uncertainty on the mean value
          """
          if self.sumw:
              return math.sqrt( self.variance() ) / math.sqrt( self.sumw )
          else:
              return None
function_tokens: def uncertainty ( self ) : if self . sumw : return math . sqrt ( self . variance ( ) ) / math . sqrt ( self . sumw ) else : return None