#NEWLINE# def _calc_rel_std_dev( self ) : #NEWLINE# #INDENT# "        Standard deviation divided by the absolute value of the average.\n\n        http://en.wikipedia.org/wiki/Relative_standard_deviation\n\n        >>> print('%1.3f' % rel_std_dev(range(97)))\n        0.583\n        " #NEWLINE# abs_mean = abs ( self . mean ) #NEWLINE# if abs_mean : #NEWLINE# #INDENT# return ( self . std_dev / abs_mean ) #NEWLINE# #UNINDENT# else : #NEWLINE# #INDENT# return self . default