Frequencies for first 10,000 rows of prov4200 variable in posclia1997 dataset :

   prov4200 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,991       99.91       99.91
          X |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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