Frequencies for first 10,000 rows of prov5040 variable in posclia2009 dataset :

 accredited |
    y match |
  date aabb |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,990       99.90       99.90
   19950727 |          5        0.05       99.95
   20010301 |          1        0.01       99.96
   20031230 |          1        0.01       99.97
   20080425 |          1        0.01       99.98
   20091016 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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