Frequencies for low variable in drg2006 dataset :

 Low Volume |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        512       91.59       91.59
          * |         47        8.41      100.00
------------+-----------------------------------
      Total |        559      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016