Frequencies for first 10,000 rows of prov1620 variable in posclia1998 dataset :

   prov1620 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,674       96.74       96.74
      00520 |        313        3.13       99.87
      01030 |         13        0.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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