Frequencies for first 10,000 rows of prov2065 variable in pos1993 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,856       88.56       88.56
          0 |        859        8.59       97.15
          1 |        209        2.09       99.24
          2 |         53        0.53       99.77
          3 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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