Frequencies for low variable in drg1995 dataset :

 Low Volume |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        458       92.53       92.53
          * |         37        7.47      100.00
------------+-----------------------------------
      Total |        495      100.00

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