Frequencies for first 10,000 rows of prov2065 variable in pos2001 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,837       88.37       88.37
          0 |        931        9.31       97.68
          1 |        168        1.68       99.36
          2 |         41        0.41       99.77
          3 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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