Frequencies for low variable in drg2000 dataset :

 Low Volume |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        469       91.78       91.78
          * |         42        8.22      100.00
------------+-----------------------------------
      Total |        511      100.00

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