Frequencies for low variable in drg1993 dataset :

 Low Volume |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        453       92.07       92.07
          * |         39        7.93      100.00
------------+-----------------------------------
      Total |        492      100.00

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