Frequencies for first 10,000 rows of prov2065 variable in pos1994 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,940       89.40       89.40
          0 |        804        8.04       97.44
          1 |        182        1.82       99.26
          2 |         50        0.50       99.76
          3 |         24        0.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017