Frequencies for first 10,000 rows of prov5040 variable in posclia1997 dataset :

   prov5040 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,926       99.26       99.26
   19950727 |         71        0.71       99.97
   19960720 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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