Frequencies for low variable in drg2007 dataset :

 Low Volume |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        524       90.50       90.50
          * |         55        9.50      100.00
------------+-----------------------------------
      Total |        579      100.00

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