Frequencies for first 10,000 rows of prov0045 variable in pos1993 dataset :

alcohol/dru |
     g unit |
  effective |
       date |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,904       99.04       99.04
     840101 |          8        0.08       99.12
     840201 |          3        0.03       99.15
     840323 |          1        0.01       99.16
     840401 |          3        0.03       99.19
     840501 |          2        0.02       99.21
     840601 |         14        0.14       99.35
     840701 |         28        0.28       99.63
     840801 |          2        0.02       99.65
     840901 |          2        0.02       99.67
     841001 |          8        0.08       99.75
     850101 |          9        0.09       99.84
     850331 |          1        0.01       99.85
     850501 |          1        0.01       99.86
     850701 |         11        0.11       99.97
     850927 |          1        0.01       99.98
     851201 |          1        0.01       99.99
     851210 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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