Frequencies for first 10,000 rows of prov0060 variable in pos2001 dataset :

alcohol/dru |
     g unit |
termination |
       date |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,909       99.09       99.09
   19840701 |          1        0.01       99.10
   19840802 |          1        0.01       99.11
   19840809 |          1        0.01       99.12
   19850101 |          1        0.01       99.13
   19850124 |          1        0.01       99.14
   19850208 |          1        0.01       99.15
   19850301 |          1        0.01       99.16
   19850630 |          1        0.01       99.17
   19850701 |          1        0.01       99.18
   19850901 |          1        0.01       99.19
   19851231 |          1        0.01       99.20
   19860416 |          1        0.01       99.21
   19860701 |          1        0.01       99.22
   19861001 |          1        0.01       99.23
   19870101 |          1        0.01       99.24
   19870630 |          1        0.01       99.25
   19870701 |          2        0.02       99.27
   19870801 |          1        0.01       99.28
   19870930 |          4        0.04       99.32
   19871001 |          3        0.03       99.35
   19871130 |          1        0.01       99.36
   19871226 |          1        0.01       99.37
   19871231 |         13        0.13       99.50
   19880101 |          1        0.01       99.51
   19880131 |          1        0.01       99.52
   19880331 |          3        0.03       99.55
   19880430 |          3        0.03       99.58
   19880531 |         10        0.10       99.68
   19880618 |          1        0.01       99.69
   19880626 |          1        0.01       99.70
   19880630 |         28        0.28       99.98
   19880831 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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