Frequencies for first 10,000 rows of prov0045 variable in pos1995 dataset :

alcohol/dru |
     g unit |
  effective |
       date |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,909       99.09       99.09
     840101 |          8        0.08       99.17
     840201 |          3        0.03       99.20
     840323 |          1        0.01       99.21
     840401 |          3        0.03       99.24
     840501 |          2        0.02       99.26
     840601 |         14        0.14       99.40
     840701 |         25        0.25       99.65
     840801 |          2        0.02       99.67
     840901 |          2        0.02       99.69
     841001 |          8        0.08       99.77
     850101 |          9        0.09       99.86
     850331 |          1        0.01       99.87
     850501 |          1        0.01       99.88
     850701 |         11        0.11       99.99
     851201 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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