Frequencies for first 10,000 rows of prov2065 variable in pos1998 dataset :

       srv: |
    alcohol |
and/or drug |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,805       88.05       88.05
          0 |        925        9.25       97.30
          1 |        198        1.98       99.28
          2 |         46        0.46       99.74
          3 |         26        0.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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