Frequencies for first 10,000 rows of prov4460 variable in pos1998 dataset :

     survey |
      total |
annual test |
     volume |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016