Frequencies for first 10,000 rows of prov2065 variable in pos1999 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,885       88.85       88.85
          0 |        872        8.72       97.57
          1 |        173        1.73       99.30
          2 |         42        0.42       99.72
          3 |         28        0.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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