Frequencies for low variable in drg1989 dataset :

 Low Volume |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        440       92.24       92.24
          * |         37        7.76      100.00
------------+-----------------------------------
      Total |        477      100.00

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