Frequencies for first 10,000 rows of prov5040 variable in posclia1999 dataset :

   prov5040 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,974       99.74       99.74
   19950727 |         23        0.23       99.97
   19960720 |          1        0.01       99.98
   19980413 |          1        0.01       99.99
   19990507 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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