Frequencies for first 10,000 rows of prov0045 variable in pos2001 dataset :

alcohol/dru |
     g unit |
  effective |
       date |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,909       99.09       99.09
   19840101 |          8        0.08       99.17
   19840201 |          3        0.03       99.20
   19840323 |          1        0.01       99.21
   19840401 |          3        0.03       99.24
   19840501 |          2        0.02       99.26
   19840601 |         14        0.14       99.40
   19840701 |         25        0.25       99.65
   19840801 |          2        0.02       99.67
   19840901 |          2        0.02       99.69
   19841001 |          8        0.08       99.77
   19850101 |          9        0.09       99.86
   19850331 |          1        0.01       99.87
   19850501 |          1        0.01       99.88
   19850701 |         11        0.11       99.99
   19851201 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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